3D Flip Cards Pure CSS and HTML

<!-- Inspired by: https://try.alexa.com/marketing-stack/seo-tools/ and https://stratus.hr/

With help from https://24ways.org/2010/intro-to-css-3d-transforms/-->

<div class="container">
  <div class="row flip-boxes">
    <div class="col-md-3 col-sm-4 col-8 flip-box">
      <div class="front">
        <div class="content text-center">
          First<br>
          <span class="click-for-more">
          </span>
        </div>
      </div>
      <div class="back">
        <div class="content">
          First Back
        </div>
      </div>
    </div>
    <div class="col-md-3 col-sm-4 col-6 flip-box">
      <div class="front" style="background-image: url(https://thumbs.dreamstime.com/b/countryside-landscape-hillside-beautiful-scenic-view-river-rural-fields-summer-season-89540702.jpg)">
        <div class="content">
          Second
        </div>
      </div>
      <div class="back">
        <div class="content">
          Second Back
        </div>
      </div>
    </div>
    <div class="col-md-3 col-sm-4 col-6 flip-box">
      <div class="front" style="background-image: url(https://llandscapes-ee1.kxcdn.com/wp-content/uploads/2017/09/33945202050_48027b6b38_z.jpg)">
        <div class="content">
          Third
        </div>
      </div>
      <div class="back">
        <div class="content">
          Third Back
        </div>
      </div>
    </div>
  </div>
</div>