CSS Only Popup Panel

Preview:

Description:

An elegant popup panel component with a scale animation, written in CSS and <details> <summary> elements.

How to use it:

1. Create a popup toggle element using <summary> element.

<summary>Click Me</summary>

2. Wrap your own popup content (like FAQ, social links, etc) together with the toggle element into a <details> element.

<details>
  <summary>Click Me</summary>
  <div>
    Popup Content Here
  </div>
</details>

3. The main CSS for the popup panel.

details {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  margin-top: 2rem;
  color: #6b7280;
  display: flex;
  flex-direction: column;
}
details div {
  background-color: #1e1e27;
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.15);
  padding: 1.25rem;
  border-radius: 8px;
  position: absolute;
  max-height: calc(100vh - 100px);
  width: 400px;
  max-width: calc(100vw - 2rem);
  bottom: calc(100% + 1rem);
  right: 0;
  overflow: auto;
  transform-origin: 100% 100%;
  color: #95a3b9;
}
details div::-webkit-scrollbar {
  width: 15px;
  background-color: #1e1e27;
}
details div::-webkit-scrollbar-thumb {
  width: 5px;
  border-radius: 99em;
  background-color: #95a3b9;
  border: 5px solid #1e1e27;
}
details div > * + * {
  margin-top: 0.75em;
}
details div p > code {
  font-size: 1rem;
  font-family: monospace;
}
details div pre {
  white-space: pre-line;
  border: 1px solid #95a3b9;
  border-radius: 6px;
  font-family: monospace;
  padding: 0.75em;
  font-size: 0.875rem;
  color: #fff;
}
details[open] div {
  -webkit-animation: scale 0.25s ease;
          animation: scale 0.25s ease;
}
summary {
  display: inline-flex;
  margin-left: auto;
  margin-right: auto;
  justify-content: center;
  align-items: center;
  font-weight: 600;
  padding: 0.75em 3em 0.75em 1.25em;
  border-radius: 99em;
  color: #fff;
  background-color: #185adb;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  list-style: none;
  text-align: center;
  cursor: pointer;
  transition: 0.15s ease;
  position: relative;
}
summary::-webkit-details-marker {
  display: none;
}
summary:hover, summary:focus {
  background-color: #1348af;
}
summary svg {
  position: absolute;
  right: 1.25em;
  top: 50%;
  transform: translateY(-50%);
  width: 1.5em;
  height: 1.5em;
}
@-webkit-keyframes scale {
  0% {
    transform: scale(0);
  }
  100% {
    transform: scale(1);
  }
}
@keyframes scale {
  0% {
    transform: scale(0);
  }
  100% {
    transform: scale(1);
  }
}