CodePen Embed - traingle

<div class="box">
  
</div>

.box {
  width: 0;
  height: 0;
  background: transparent;
  border-top: 10px solid transparent;
  border-left: 10px solid transparent;
  border-right: 10px solid #00BBFF;
  border-bottom: 10px solid #00BBFF;
}

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