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<input type="checkbox" id="mo"><label for="mo" class="open">Open dialog</label><div class="ov"><label for="mo" class="bd"></label><div class="box"><h3>Delete file?</h3><p>This action cannot be undone.</p><label for="mo" class="ok">Got it</label></div></div>About this layout
Checkbox Modal Dialog is a pure CSS layout made with HTML and CSS only, by @admin. Open an example, copy the HTML and the CSS, and paste them into your page. There is nothing to install and no JavaScript to load.