Overthere（左）のアイコン

<span class="dli-overthere-left"></span>

.dli-overthere-left {
  display: inline-block;
  vertical-align: middle;
  color: #333;
  line-height: 1;
  position: relative;
  width: 0.625em;
  height: 0.625em;
  border-style: solid;
  border-color: currentColor;
  border-width: 0.3125em 1px 0 0;
  border-radius: 0 0.625em 0 0;
  box-sizing: border-box;
}

.dli-overthere-left::before {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-color: transparent;
  border-width: 0.40625em 0.40625em;
  border-right-color: currentColor;
  border-left: 0;
  position: absolute;
  top: -0.15625em;
  right: 100%;
  transform: translateY(-50%);
}