.blocklyToolboxCategory[aria-expanded="false"],
.blocklyToolboxCategory[aria-expanded="true"],
.blocklyToolboxCategory[aria-expanded="undefined"] {
  position: relative;
}

.blocklyToolboxCategory[aria-expanded="false"]>.blocklyTreeRow::after,
.blocklyToolboxCategory[aria-expanded="true"]>.blocklyTreeRow::after,
.blocklyToolboxCategory[aria-expanded="undefined"]>.blocklyTreeRow::after {
  font-family: "Font Awesome 5 Free";
  font-weight: 900;
  content: "\f078";
  font-size: 0.8em;
  
  color: var(--text-1);
  padding-right: 0.5em;
  transform: rotate(270deg);
  transition: transform 0.2s ease;
  
  position: absolute;
  right: 0.1em;
  top: 1em;

  display: flex;
  align-items: center;
  
  height: 1em;
  width: 1em;
}

.blocklyToolboxCategory[aria-expanded="true"]>.blocklyTreeRow::after {
  transform: rotate(360deg);
}