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a[aria-expanded="true"] .triangle-down {
  border: solid black;
  border-width: 0 1px 1px 0;
  display: inline-block;
  padding: 3px;
  transform: rotate(-135deg);
  -webkit-transform: rotate(-135deg);  
  margin-left: 20px;
} 


.triangle-down{
  border: solid black;
  border-width: 0 1px 1px 0;
  display: inline-block;
  padding: 3px;
  transform: rotate(45deg);
  -webkit-transform: rotate(45deg);
  margin-left: 20px;
}