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HTML

              
                <!DOCTYPE html>
<html>
  <body>
    <!-- This will trigger our modal via CSS selectors -->
    <input type="checkbox" class="checkbox-modal-toggle" id="IDMODAL" />
    <!-- Here we have our centered modal -->
    <div class="modal">Lorem Ipsum Dolor Sit Amet Consectetur</div>
    <!-- Here we have our closing label which is, in fact, the modal overlay -->
    <label for="IDMODAL" class="modal-overlay"></label>
    <!-- Some fake page content -->
    <p>Lorem Ipsum Dolor Sit Amet Consectetur</p>
    <!-- Here we have our modal trigger. I'm using the class just to put some style on it -->
    <label class="modal-trigger" for="IDMODAL">Click Here To Trigger a Modal</label>
  </body>
</html>
              
            
!

CSS

              
                html, body {
  margin: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

body {
  padding: 8px;
}

.modal {
  position: fixed;
  z-index: 2;
  display: none;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translateX(-50%) translateY(-50%);
  width: 300px;
  height: 300px;
  background-color: white;
  color: black;
  text-align: center;
  padding: 6px;
  transition: opacity 3000ms ease-in-out;
}
.checkbox-modal-toggle:checked + .modal {
  display: block;
}

.modal-overlay, .checkbox-modal-toggle + .modal + label {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  display: none;
  background-color: #000000;
  opacity: 0.4;
  cursor: pointer;
}
.checkbox-modal-toggle:checked + .modal + .modal-overlay, .checkbox-modal-toggle:checked + .modal + label {
  display: block;
}

.checkbox-modal-toggle {
  margin: -1px;
  padding: 0;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip: rect(0, 0, 0, 0);
  position: absolute;
}

.modal-trigger {
  border-radius: 30px;
  padding: 8px;
  background: #0045ff;
  color: white;
}

              
            
!

JS

              
                
              
            
!
999px

Console