.collapsible {
  background-color: var(--background-alt-color);
  cursor: pointer;
  border: none;
  text-align: left;
  outline: none;
}

.collapsible.active, .collapsible:hover {
  background-color: var(--background-mod-color);
}

.collapsible:before {
  display: inline-block;
  width: 15px;
  height: 1.5em;
  text-align: center;
  content: '\0276F'; 
  margin: 5px;
  transition: 0.5s;
}

.collapsible.active:before {
  transform: rotate(90deg);
}

.collapsible-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease-out;
}

.collapsible-content > * {
  margin: 18px;
}