summary {
  padding: 1rem;
  font-size: 1rem;
  line-height: 1;
  background: #ededed;
  cursor: pointer;
  user-select: none;
}

summary:hover {
  background: #e8e8e8;
}

summary:active {
  background: #dedede;
}

details {
  overflow: hidden;
  height: 3rem;
  border: 1px solid #ccc;
  -webkit-transition: height 150ms ease;
  -o-transition: height 150ms ease;
  transition: height 150ms ease;
  margin-bottom: 1em;
}

details[open] {
  height: 8rem;
}

details section {
  padding: 1rem;
}