.panel-heading a {
  display: block;
  position: relative;
  font-weight: bold;
}
.panel-heading a::after {
  content: "";
  border: solid #424242;
  border-width: 0 1px 1px 0;
  display: inline-block;
  padding: 6px;
  position: absolute;
  right: 6px;
  top: 25px;
  transform: rotate(45deg);
}
.panel-heading a[aria-expanded=true]::after {
  transform: rotate(-135deg);
  top: 30px;
}

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