Modal jen pomocí css a html summary

by Petr Haluza

HTML

<div class="container">

  <details>
    <summary>
      <div class="button">Jsem jakože tlačítko</div>
      <div class="details-modal-overlay"></div>
    </summary>
    <div class="details-modal">
      <div class="details-modal-close">x</div>
      <div class="details-modal-title">
        <h1>Jsem jakože modal</h1>
      </div>
      <div class="details-modal-content">
        <p>Blah blah a zacvřu se klikem kamkoliv jinam, nebo na křížek</p>
      </div>
    </div>
  </details>
  
</div>

CSS

*,
*:before,
*:after {
  box-sizing: border-box;
}


.button { background: #16a34a; color: white; padding:  1em;}

.details-modal {
  background: #ffffff;
  border-radius: 0.5em;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  left: 50%;
  max-width: 90%;
  pointer-events: none;
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 30em;
  text-align: left;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
}
.details-modal .details-modal-close {
  align-items: center;
  display: flex;
  height: 4.5em;
  justify-content: center;
  pointer-events: none;
  position: absolute;
  right: 0;
  top: 0;
  width: 4.5em;
}
.details-modal .details-modal-title {
  color: #111827;
  padding: 1.5em 2em;
  pointer-events: all;
  position: relative;
  width: calc(100% - 4.5em);
}
.details-modal .details-modal-content {
  border-top: 1px solid #e0e0e0;
  padding: 2em;
  pointer-events: all;
  overflow: auto;
}

.details-modal-overlay {
  transition: opacity 0.2s ease-out;
  pointer-events: none;
  background: rgba(15, 23, 42, 0.8);
  position: fixed;
  opacity: 0;
  bottom: 0;
  right: 0;
  left: 0;
  top: 0;
}
details[open] .details-modal-overlay {
  pointer-events: all;
  opacity: 0.5;
}



details > summary {
    list-style-type: none;
}

details > summary::-webkit-details-marker {
    display: none;
}

details > summary::before {
    content: '?';
}

details[open] > summary::before {
    content: 'x';
}