The Power of Pure CSS - No JavaScript Needed

/* common css */
body {
	margin: 0;
	padding: 0;
	background: #262626;
}

h2 {color: #fff; text-align: center;}

/* button hover amazing effect */
a {
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	text-transform: uppercase;
	text-decoration: none;
	text-align: center;
	/* line-height: 2; */
	color: #ff0;
	font-size: 30px;
	font-family: verdana;
	letter-spacing: 4px;

/* use combination of any two */
	/* 1. */
	/* padding: 5px; */

/* 2. */
	padding-left: 5px;
	/* padding-right: 5px; */
}

a::before,
a::after,
span::before,
span::after {
	content: '';
	position: absolute;
	width: 8px;
	height: 8px;
	background: transparent;
	transition: 1s;
	/* -webkit-mix-blend-mode: hue; */
}

a::before {
	top: -2px;
	left: -2px;
	border-top: 2px solid #ff0;
	border-left: 2px solid #ff0;
}
a::after {
	top: -2px;
	right: -2px;
	border-top: 2px solid #ff0;
	border-right: 2px solid #ff0;
}

span::before {
	bottom: -2px;
	left: -2px;
	border-bottom: 2px solid #ff0;
	border-left: 2px solid #ff0;
}
span::after {
	bottom: -2px;
	right: -2px;
	border-bottom: 2px solid #ff0;
	border-right: 2px solid #ff0;
}

a:hover::before,
a:hover::after,
a:hover span::before,
a:hover span::after  {
	width: calc( 180px / 2);
	height: calc( 50px / 2);
}

118

Cool Css Button Border Animation On Hover – CSS3 Hover Effects – Pure CSS

By: pixeldev

/*-------------------
Reset browser CSS
-------------------*/
* {
  padding: 0px;
  margin: 0px;
  border: 0 none;
  box-sizing: border-box;
}

body {
  width: 100%;
  height: 100%;
  min-height: 400px;
  background-color: #ffffff;
  font-family: 'Josefin Sans', Arial, sans-serif;
  font-style: normal;
}

/*---------------------
Header Styling
---------------------*/

/* header container */
header {
  position: relative;
  height: 100px;
  width: 100%;
  min-width: 800px;
  background: #cbf3f0;
}

/* navbar container */
#mainmenu-navbar {
  position: absolute;
  bottom: 0px;
  right: 0px;
  margin-right: 15px;
}

/* navbar items */
.main-menu.tab > li {
  list-style: none;
  display: inline-block;
  position: relative;
  min-width: 150px;
  padding: 0.5em;
  margin: 0px 5px;
  
  font-size: 16pt;
  text-align: center;
  text-transform: uppercase;
  line-height: 1.3em;
}

/* submenu container */
.dropdown.container {
  display: none;
}

/*------------------
Navbar Text
------------------*/

a {
  text-decoration: none;
}

.main-menu.tab a {
  color: #2ec4b6;
}

.dropdown.container a {
  color: #ffffff;
  font-weight: 300;
  text-transform: capitalize;
}

/*-------------------
Hover Styles
-------------------*/

/* main menu items */
.main-menu.tab > li:hover > a {
  color: #26a195;
}

/* submenu title */
li.dropdown.tab:hover > a {
  color: #cbf3f0;
}

/* submenu title background */
.dropdown.tab:hover {
  background: #26a195;
}

/* submenu container */
.dropdown.tab:hover .dropdown.container {
  display: block;
  position: absolute;
  top: 2.3em; /* 1.3em + 2 * 0.5em */
  left: 0px;
  
  margin-top: -1px;
  padding: 1em 0em;
  background: #2ec4b6;
}

/* submenu items */
.dropdown.tab:hover li {
  list-style: none;
  line-height: 1em;
  text-align: left;
  padding: 0.5em;
  min-width: 150px;
}

/* submenu item highlight */
.dropdown.container > li:hover {
  background: #ff9f1c;
}

/**** end of header styling ****/

88

Header navigation menu with dropdown on hover (pure CSS)

By: pixeldev

*, *:after, *:before {
  box-sizing: border-box;
  -moz-box-sizing: border-box;
}
* {margin:0;padding:0;border:0 none;position: relative; outline: none;
}
html, body {
  background:  #004050;
  font-family: Quando;
  font-weight: 300;
  width: 100%;
}
h2, h3 {
  background: #0D757D;
  width: 100%;
  min-height: 200px;
  line-height: 200px;
  font-size: 3rem;
  font-weight: normal;
  text-align: center;
  color: rgba(0,0,0,.4);
  margin: 3rem auto 0;
}
.uno {background: #ff5e33;}
.dos.bis {background: #85144B;}
.dos {background: #FADD40;}
h3 {background: #2B5B89;}

h2 > a, h3 > a {
  text-decoration: none;
  color: rgba(0,0,0,.4);
  z-index: 1;
}

h2 > a:before {
  content: "";
  position: absolute;
  width: 100%;
  height: 3px;
  bottom: 0;
  left: 0;
  background: #9CF5A6;
  visibility: hidden;
  border-radius: 5px;
  transform: scaleX(0);
  transition: .25s linear;
}
h2 > a:hover:before,
h2 > a:focus:before {
  visibility: visible;
  transform: scaleX(1);
}
.uno a:before {
  background: rgba(0,0,0,0);
  box-shadow: 0 0 10px 2px #ffdb00;  
}
.dos > a:after {
  content: "";
  position: absolute;
  width: 100%;
  height: 7px;
  border: 1px solid #000;
  bottom: -2px;
  left: 0;
  background: #fff;
  border-radius: 5px;
  opacity: 0;
  transform: scalex(0);
  transition: .5s;
}
.dos.bis > a:after {
  opacity: .05;
  transform: scalex(1);
}
.dos:hover > a:after {
  opacity: .15;
  transform: scalex(1);
}
.dos.bis > a:before {
  background: rgba(0,0,0,0);
  box-shadow: 0 0 10px 2px #FADD40;
}
.dos > a:before {
  background: rgba(0,0,0,0);
  box-shadow: 0 0 10px 2px #FF5E33;
}

h3 > a:before {
  content: "";
  background: #7FDBFF;
  position: absolute;
  width: 100%;
  height: 5px;
  bottom: 0;
  left: 0;
  border-radius: 5px;
  transform: scaleX(0);
  animation: 1.4s forwards no-hover-v linear;
  animation-fill-mode: forwards;
  z-index: -1;
}
h3 > a:hover:before,
h3 > a:focus:before {
  animation: .5s forwards hover-v linear;
  animation-fill-mode: forwards;
}
@keyframes hover-v {
  0% {
      transform: scaleX(0);
      height: 5px;
     }
  45% {   
      transform: scaleX(1.05);
      height: 5px;
     }
  55% {height: 5px;}
  100% {
      transform: scaleX(1.05);
      height: 3.8rem;
     }
}
@keyframes no-hover-v {
  0% {
      transform: scaleX(1.05);
      height: 3.8rem;
     }
  45% {height: 5px;}
  55% {   
      transform: scaleX(1.05);
      height: 5px;
      opacity: 1;
     }
  
  100% {
      transform: scaleX(0);
      height: 5px;
      opacity: .02;
     }
}

p {padding: .5rem;}
p a {color: rgba(255,255,255,.5)}

75

text-decoration: underline animated

By: pixeldev

@import 'https://fonts.googleapis.com/css?family=Open+Sans+Condensed:300';

/*
 FORMATTING FOR CODEPEN
*/

html,body {
  height: 100%;
  width: 100%;
  margin: 0;
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  font-family: 'Open Sans Condensed', sans-serif;
}

.col {
  height: 100%;
}

div[class*=container] {
  text-align: center;
  width: 100%;
  height: 33%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container-1 { background: #333; }
.container-2 { background: #4E598C; }
.container-3 { background: #8499B1; }
.container-4 { background: #9888A5; }
.container-5 { background: #7B6D8D; }
.container-6 { background: #565554; }

/*
 BUTTON STYLING
*/

.btn {
  position: relative;
  color: white;
  width: 256px;
  height: 64px;
  line-height: 64px;
  transition: all 0.3s;
  span {
    transition: all 0.3s;
    tranform: scale(1, 1);
  }
}

.btn::before, .btn::after {
  content: '';
  position: absolute;
  transition: all 0.3s;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.btn-one::before {
	left: 4px;
	z-index: 1;
  
  opacity: 0;
  background: rgba(255, 255, 255, 0.1);
  transform: scale(0.1, 1);
}

.btn-one:hover::before {
  opacity: 1;
  transform: scale(1, 1);
}

.btn-one::after {
  transition: all 0.3s;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.btn-one:hover::after {
  transform: scale(1, .1);
  opacity: 0;
}

/* BTN TWO */
.btn-two::before, .btn-two::after {
  content: '';
  position: absolute;
  width: 100%;
	height: 100%;
  bottom: 0;
	left: 0;
	z-index: 1;
  transition: all 0.3s;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.btn-two:hover::after {
  animation-name: rotatecw;
  animation-duration: 2s;
}
.btn-two:hover::before {
  animation-name: rotateccw; 
  animation-duration: 3s;
}
.btn-two:hover::after, .btn-two:hover::before {
  left: 96px;
  width: 64px;
  
  animation-iteration-count: infinite;
  animation-timing-function: linear;
}

@keyframes rotatecw {
    from {transform: rotate(0deg);}
    to {transform: rotate(360deg);}
}

@keyframes rotateccw {
    from {transform: rotate(0deg);}
    to {transform: rotate(-360deg);}
}

/* BTN THREE */
.btn-three::before {
  opacity: 0;
  background: rgba(255, 255, 255, 0.1);
  transform: scale(1, 0.1);
}

.btn-three:hover::before {
  opacity: 1;
  transform: scale(1, 1);
}

.btn-three::after {
  transition: all 0.3s;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.btn-three:hover::after {
  transform: scale(1, .1);
  opacity: 0;
}

/* BTN FOUR */

.btn-four:hover span {
  transform: scale(1.2, 1.2);
}

.btn-four::before {
  opacity: 0;
  background: rgba(255, 255, 255, 0.1);
  transform: scale(0.1, 0.1);
}

.btn-four:hover::before {
  opacity: 1;
  transform: scale(1, 1);
}

.btn-four::after {
  transition: all 0.3s;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.btn-four:hover::after {
  transform: scale(0, 0);
  opacity: 0;
}

/* BTN FIVE */
.btn-five::before {
  transition: transform 0.15s, 0.15s border-radius 0.15s;
  opacity: 0;
  background: rgba(255, 255, 255, 0.1);
  transform: scale(0.1, 0.1);
  border-radius: 50%;
}

.btn-five:hover::before {
  opacity: 1;
  transform: scale(1, 1);
  border-radius: 0;
}

.btn-five::after {
  transition: all 0.3s;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-five:hover::after {
  opacity: 0;
}

/* BTN SIX */
.btn-six::before {
  opacity: 0;
  background: rgba(255, 255, 255, 0.1);
  transform: scale(1.3, 1.3);
}

.btn-six:hover::before {
  opacity: 1;
  transform: scale(1, 1);
}

.btn-six::after {
  transition: all 0.3s;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.btn-six:hover::after {
  transform: scale(0, 0);
  opacity: 0;
}

70

Six Pure CSS Button Hover Animations

By: pixeldev

61

Button Hover Effect

By: pixeldev

body {
    padding:15px;
}
#heart {
    display:block;
    height:70px;
    width:70px;
    position:relative;
}
#heart .fill {
    display: block;
    height: 70px;
    left: -1px;
    overflow: hidden;
    position: absolute;
    top: -4px;
    width: 70px;
    z-index: 3;
    -webkit-transition: height 2s ease-in-out;
    -moz-transition: height 2s ease-in-out;
    -o-transition: height 2s ease-in-out;
    -ms-transition: height 2s ease-in-out;
    transition: height 2s ease-in-out;
}
#heart .fill:before, #heart .fill:after {
    background: #e74c3c;
    border-radius: 85px 60px 0 0;
    content:"";
    height: 59px;
    left: 37px;
    position: absolute;
    top: 6px;
    width: 36px;
    -moz-border-radius: 50px 50px 0 0;
    border-radius: 85px 60px 0 0;
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
    -webkit-transform-origin: 0 100%;
    -moz-transform-origin: 0 100%;
    -ms-transform-origin: 0 100%;
    -o-transform-origin: 0 100%;
    transform-origin: 0 100%;
}
#heart .fill:after {
    left: 1px;
    -webkit-transform: rotate(45deg);
    border-radius: 45px 60px 0 0;
    -moz-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
    -webkit-transform-origin: 100% 100%;
    -moz-transform-origin: 100% 100%;
    -ms-transform-origin: 100% 100%;
    -o-transform-origin: 100% 100%;
    transform-origin: 100% 100%;
}
#heart .outline {
    position: relative;
    margin-left: 8px;
}
#heart .outline:before, #heart .outline:after {
    position: absolute;
    content:"";
    left: 28px;
    top: 1px;
    width: 39px;
    height: 62px;
    background: #d53423;
    -moz-border-radius: 50px 50px 0 0;
    border-radius: 85px 60px 0 0;
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
    -webkit-transform-origin: 0 100%;
    -moz-transform-origin: 0 100%;
    -ms-transform-origin: 0 100%;
    -o-transform-origin: 0 100%;
    transform-origin: 0 100%;
}
#heart .outline:after {
    left: -11px;
    -webkit-transform: rotate(45deg);
    border-radius: 45px 60px 0 0;
    -moz-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
    -webkit-transform-origin: 100% 100%;
    -moz-transform-origin: 100% 100%;
    -ms-transform-origin: 100% 100%;
    -o-transform-origin: 100% 100%;
    transform-origin: 100% 100%;
}
#heart:hover .fill {
    height:0px;
}

59

Hover Fill my Heart Up

By: pixeldev

@import url('https://fonts.googleapis.com/css?family=Oswald');

body {
	margin: 0px;
}

#circle-container {
	display: flex;
	align-items: center;
	justify-content: center;
	background-color: lightblue;
	width: 100vw;
	height: 100vh;
	position: relative;
}

.circle {
	width: 50vh;
	height: 50vh;
	position: absolute;
	border-radius: 50%;
}

#one:before {
	content: "Hover Me!";
}

#one {
	background-color: rgba(0,0,225, 0.45);
	font-size: 40px;
	font-family: "Oswald", sans-serif;
	letter-spacing: 1.5px;
	display: flex;
	justify-content: center;
	align-items: center;
	color: white;
	font-weight: bold;
	transition: 1s;
}

#two {
	background-color: green;
	transition: 1s;
	opacity: 0.5;
}

#three {
	background-color: red;
	transition: 1s;
	opacity: 0.5;
}

#four {
	background-color: orange;
	transition: 1s;
	opacity: 0.5;
}
#five {
	background-color: green;
	transition: 1s;
	opacity: 0.5;
}

#cc {
	position:relative;
	width: 50vh;
	height: 50vh;
	border-radius: 50%;
	overflow: hidden;
}

#cc:hover #two {
	transform: translate(0px, 75px);
}
#cc:hover #three {
	transform: translate(0px, -75px);
}
#cc:hover #four {
	transform: translate(75px, 0px);
}
#cc:hover #five {
	transform: translate(-75px, 0px);
}

#mb {
	position: absolute;
	font-family: "Oswald", sans-serif;
	letter-spacing: 0.5px;
	bottom: 0px;
	display: flex;
	justify-content: center;
	width: 100vw;
	background-color: #3B3A6D;
	color: white;
}

#mb a {
	color: white;
	text-decoration: none;
	font-weight: bold;
	padding: 0px;
}

#mb p {
	padding: 5px;
	margin: 0px;
}

56

Pure CSS Circle Hover Affect

By: pixeldev

/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: #3A3033;
}

.container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100vh;
  overflow: hidden;
  background: #70B7CC;
}

.container--c-0 {
  background: #3A3033;
}

.icon {
  position: relative;
  width: 240px;
  height: 240px;
  animation: delayIn 1s ease-in 1;
}

@media screen and (max-width: 400px) {
  .icon {
    width: 180px;
    height: 180px;
  }
}

.sun {
  position: relative;
  width: 100%;
  height: 100%;
  background: #FFF031;
  border-radius: 50%;
  animation: raySpin 20s linear infinite;
}

.sun::before {
  display: block;
  content: '';
  position: absolute;
  z-index: -200;
  width: 100%;
  height: 100%;
  background: #FFF031;
  border-radius: 50%;
  transform: scale(0.9);
  animation: blastIn .35s ease-in-out 1;
  pointer-events: none;
}

.sun::after {
  display: block;
  content: '';
  position: absolute;
  z-index: -100;
  width: 100%;
  height: 100%;
  background: #FFF031;
  border-radius: 50%;
  pointer-events: none;
}

.sun:hover::before {
  animation: blastOut .5s ease-in-out 1;
}

.sun:hover::after {
  animation: bounce .5s ease-in-out 1;
}

.sun__rays {
  position: absolute;
  z-index: -400;
  width: 140%;
  height: 140%;
  top: -20%;
  left: -20%;
  transform: scale(0.5);
  animation: raysIn .5s ease-in-out 1 forwards;
  pointer-events: none;
}

.sun:hover .sun__rays {
  animation: raysOut .5s ease-in-out 1 forwards;
}

.sun__ray {
  position: absolute;
  left: 50%;
  width: 2%;
  height: 100%;
  margin-left: -1%;
}

.sun__ray:nth-of-type(2) { transform: rotate(20deg); }
.sun__ray:nth-of-type(3) { transform: rotate(40deg); }
.sun__ray:nth-of-type(4) { transform: rotate(60deg); }
.sun__ray:nth-of-type(5) { transform: rotate(80deg); }
.sun__ray:nth-of-type(6) { transform: rotate(80deg); }
.sun__ray:nth-of-type(7) { transform: rotate(100deg); }
.sun__ray:nth-of-type(8) { transform: rotate(120deg); }
.sun__ray:nth-of-type(9) { transform: rotate(140deg); }
.sun__ray:nth-of-type(10) { transform: rotate(160deg); }

.sun__ray::before,
.sun__ray::after {
  display: block;
  content: '';
  position: absolute;
  width: 100%;
  height: 10%;
  background: rgba(255, 255, 255, 0.4);
}

.sun__ray::before {
  top: 0;
}

.sun__ray::after {
  bottom: 0;
}

/* Animations */
@keyframes blastOut {
  0% { transform: scale(0.9); opacity: .6; }
  100% { transform: scale(10); opacity: 0; }
}

@keyframes blastIn {
  0% { transform: scale(10); opacity: 0; }
  30% { opacity: 0.1; }
  100% { transform: scale(0.9); opacity: 0; }
}

@keyframes bounce {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

@keyframes raysOut {
  0% { transform: scale(0.5); }
  100% { transform: scale(1); }
}

@keyframes raysIn {
  0% { transform: scale(1); }
  100% { transform: scale(0.5); }
}

@keyframes raySpin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(359.999deg); }
}

@keyframes delayIn {
  0% { transform: scale(0); }
  50% { transform: scale(0); }
  100% { transform: scale(1); }
}

55

Pure CSS Animated Weather Icon Hover

By: pixeldev

.container {
    margin: 0 auto;
    width: 100%;
    text-align: center;
    font-size: 0;
    font-family: Arial, Helvetica, sans-serif;
    font-weight: 400;
    background: #ffffff;
}

h2.title {
    position: relative;
    margin-bottom: 15px;
    padding-bottom: 15px;
    font-size: 30px;
    color: #222222;
}

h2.title::after {
    position: absolute;
    content: "";
    width: 50px;
    height: 3px;
    left: calc(50% - 25px);
    bottom: 0;
    background: #222222;
}

p {
    position: relative;
    margin: 15px auto;
    font-size: 16px;
    color: #222222;
}

.btn {
    position: relative;
    display: inline-block;
    margin: 15px;
    padding: 12px 27px;
    text-align: center;
    font-size: 16px;
    letter-spacing: 1px;
    text-decoration: none;
    color: #999999;
    background: #ffffff;
    border: 3px solid #999999;
    cursor: pointer;
    transition: ease-out 0.5s;
    -webkit-transition: ease-out 0.5s;
    -moz-transition: ease-out 0.5s;
}

.btn.btn-border-1::after,
.btn.btn-border-1::before {
    position: absolute;
    content: "";
    width: 0%;
    height: 0%;
    visibility: hidden;
}

.btn.btn-border-1::after {
    bottom: -3px;
    right: -3px;
    border-left: 3px solid #222222;
    border-bottom: 3px solid #222222;
    transition: width .1s ease .1s, height .1s ease, visibility 0s .2s;
}

.btn.btn-border-1::before {
    top: -3px;
    left: -3px;
    border-top: 3px solid #222222;
    border-right: 3px solid #222222;
    transition: width .1s ease .3s, height .1s ease .2s, visibility 0s .4s;
}

.btn.btn-border-1:hover {
    animation: pulse 1s ease-out .4s;
    color: #222222;
}

.btn.btn-border-1:hover::after,
.btn.btn-border-1:hover::before {
    width: calc(100% + 3px);
    height: calc(100% + 3px);
    visibility: visible;
    transition: width .1s ease .2s, height .1s ease .3s, visibility 0s .2s;
}

.btn.btn-border-1:hover::after {
    transition: width .1s ease .2s, height .1s ease .3s, visibility 0s .2s;
}

.btn.btn-border-1:hover::before {
    transition: width .1s ease, height .1s ease .1s;
}

.btn.btn-border-2::after,
.btn.btn-border-2::before {
    position: absolute;
    content: "";
    width: 0;
    height: 0;
    transition: .5s;
}

.btn.btn-border-2::after {
    top: -3px;
    left: -3px;
    border-top: 3px solid transparent;
    border-left: 3px solid transparent;
}

.btn.btn-border-2::before {
    bottom: -3px;
    right: -3px;
    border-bottom: 3px solid transparent;
    border-right: 3px solid transparent;
}

.btn.btn-border-2:hover {
    color: #222222;
}

.btn.btn-border-2:hover::after,
.btn.btn-border-2:hover::before {
    width: calc(50% + 3px);
    height: calc(50% + 3px);
    border-color: #222222;
}

.btn.btn-border-3::after,
.btn.btn-border-3::before {
    position: absolute;
    content: "";
    width: 0;
    height: 0;
    transition: .5s;
}

.btn.btn-border-3::after {
    top: -9px;
    left: -9px;
    border-top: 3px solid transparent;
    border-left: 3px solid transparent;
}

.btn.btn-border-3::before {
    bottom: -9px;
    right: -9px;
    border-bottom: 3px solid transparent;
    border-right: 3px solid transparent;
}

.btn.btn-border-3:hover {
    color: #222222;
}

.btn.btn-border-3:hover::after,
.btn.btn-border-3:hover::before {
    width: 30px;
    height: 30px;
    border-color: #222222;
}

.btn.btn-border-4::after,
.btn.btn-border-4::before {
    position: absolute;
    content: "";
    width: 0;
    height: 0;
    transition: .5s;
}

.btn.btn-border-4::after {
    top: -9px;
    left: -9px;
    border-top: 3px solid transparent;
    border-left: 3px solid transparent;
}

.btn.btn-border-4::before {
    bottom: -9px;
    right: -9px;
    border-bottom: 3px solid transparent;
    border-right: 3px solid transparent;
}

.btn.btn-border-4:hover {
    color: #222222;
}

.btn.btn-border-4:hover::after,
.btn.btn-border-4:hover::before {
    width: calc(100% + 15px);
    height: calc(100% + 15px);
    border-color: #222222;
}

.btn.btn-border-5::after,
.btn.btn-border-5::before {
    position: absolute;
    content: "";
    width: 0;
    height: 0;
    transition: .5s;
}

.btn.btn-border-5::after {
    top: 0;
    left: 0;
    border-top: 3px solid transparent;
}

.btn.btn-border-5::before {
    bottom: 0;
    right: 0;
    border-bottom: 3px solid transparent;
}

.btn.btn-border-5:hover {
    color: #222222;
}

.btn.btn-border-5:hover::after,
.btn.btn-border-5:hover::before {
    width: 100%;
    height: 100%;
    border-color: #222222;
}

53

CSS Buttons Hover Effects

By: pixeldev

@import url(https://fonts.googleapis.com/css?family=Open+Sans);

html, body {
  background-color: rgb(23,25,31);
  font-family: "open sans";
  color: rgba(255,255,255,0.5);
  text-align: center;
}

ul {
  list-style: none;
  padding-top: 50px;
}

h1 {
  font-weight: 100;
  color: white;
}

.cont {
  width: 700px;
  height: 100%;
  margin-left: auto;
  margin-right: auto;
}

#button {
  cursor: pointer;
  width: 150px;
  height: 40px;
  line-height: 40px;
  background-color: transparent;
  border: 1px solid rgba(255,255,255,0.5);
  float: left;
  transition: all 0.5s;
}

#button:hover {
  box-shadow: 0 0 12px rgba(70,150,240,0.7) inset;
  border: 1px solid rgba(255,255,255,1);
  color: rgba(255,255,255,1);
}

#button2 {
  cursor: pointer;
  width: 150px;
  height: 40px;
  line-height: 40px;
  background-color: transparent;
  border: 1px solid rgba(255,255,255,0.5);
  float: left;
  transition: all 0.5s;
}

#button2:hover {
  box-shadow: 0 40px 12px rgba(70,150,240,0.25) inset, 0 -40px 12px rgba(70,150,240,0.25) inset;
  border: 1px solid rgba(255,255,255,1);
  color: rgba(255,255,255,1);
}

#button3 {
  cursor: pointer;
  width: 150px;
  height: 40px;
  line-height: 40px;
  background-color: transparent;
  border: 1px solid rgba(255,255,255,0.5);
  float: left;
  transition: all 0.5s;
}

#button3:hover {
  box-shadow: 0 0 8px 4px rgba(70,150,240,0.25) inset, 0 0 8px 4px rgba(70,150,240,0.25);
  border: 1px solid rgba(70,150,240,1);
  color: rgba(255,255,255,1);
}

51

Button hover inner shadow

By: pixeldev

.button {
  display: inline-block;
  padding: 0.75rem 1.25rem;
  border-radius: 10rem;
  color: #fff;
  text-transform: uppercase;
  font-size: 1rem;
  letter-spacing: 0.15rem;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.button:after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #0cf;
  border-radius: 10rem;
  z-index: -2;
}

.button:before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 100%;
  background-color: #0099cc; /* manually darkened #0cf */
  transition: all 0.3s;
  border-radius: 10rem;
  z-index: -1;
}

.button:hover {
  color: #fff;
}

.button:hover:before {
  width: 100%;
}

/* Optional reset for presentation */
* {
  font-family: Arial;
  text-decoration: none;
  font-size: 20px;
}

.container {
  padding-top: 50px;
  margin: 0 auto;
  width: 100%;
  text-align: center;
}

h1 {
  text-transform: uppercase;
  font-size: 0.8rem;
  margin-bottom: 2rem;
  color: #777;
}

50

Pure Css Button Hover effect

By: pixeldev

@import url("https://fonts.googleapis.com/css?family=Open+Sans:300,600");

body {
  background-color: #fff;
  -webkit-font-smoothing: antialiased;
  font-smoothing: antialiased;
  height: 100vh;
  font-family: 'Open Sans', sans-serif;
}

h1 {
  font-size: 50px;
  text-align: center;
  font-weight: 300;
  color: #777;
  margin-bottom: 0;
}

h2 {
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 3px;
  font-size: 16px;
  color: #bbb;
}

.icons {
  font-size: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.icon {
  display: inline-block;
  width: 40px;
  height: 50px;
  border-radius: 2px;
  cursor: pointer;
  position: relative;
  margin: 0 5px;
}

.icon::after {
  content: '';
  position: absolute;
  display: block;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-radius: 0 2px;
  transition: all 0.2s linear;
  backface-visibility: hidden;
}

/* DOC */
.icon--doc {
  background-color: #4285f4;
}
.icon--doc::after {
  background: linear-gradient(45deg, #669df6 50%, #fff 50%);
}
.icon--doc i::before {
  content: '☰';
}

/* PDF */
.icon--pdf {
  background-color: #db4437;
}
.icon--pdf::after {
  background: linear-gradient(45deg, #e36a60 50%, #fff 50%);
}
.icon--pdf i::before {
  content: '☵';
}

/* SHEETS */
.icon--sheets {
  background-color: #0f9d58;
}
.icon--sheets::after {
  background: linear-gradient(45deg, #39b378 50%, #fff 50%);
}
.icon--sheets i::before {
  content: '⊟';
}

/* SLIDES */
.icon--slides {
  background-color: #f5b707;
}
.icon--slides::after {
  background: linear-gradient(45deg, #f8c53f 50%, #fff 50%);
}
.icon--slides i::before {
  content: '⧉';
}

/* CODE */
.icon--code {
  background-color: #00a78e;
}
.icon--code::after {
  background: linear-gradient(45deg, #26bfa6 50%, #fff 50%);
}
.icon--code i::before {
  content: '< >';
}

.icon i {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: block;
  font-size: 10px;
  color: #fff;
  font-weight: 500;
}

.icon i::before,
.icon i::after {
  display: block;
  transition: all 0.2s linear;
}

.icon i::before {
  text-align: center;
  font-size: 12px;
  opacity: 0;
  transform: translateY(5px);
}

.icon i::after {
  content: attr(title);
  transform: translateY(-5px);
}

.icon:hover {
  border-radius: 2px 4px 2px 2px;
}

.icon:hover::after {
  width: 12px;
  height: 12px;
}

.icon:hover i::before {
  transform: translateY(0);
  opacity: 1;
}

.icon:hover i::after {
  transform: translateY(0);
}

47