CodePen Embed - border

<div class="wrap">
  <div class="main"></div>
</div>

.main {
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 80px 100px;
  border-color: transparent;
  border-left-color: #0aaaa0;
  border-right: none;
}

.wrap {
  display: flex;
  justify-content: center;
  margin: 40px auto 0;
}

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