ダウンロードのアイコン

<span class="dli-box-in"><span></span></span>

.dli-box-in {
  display: inline-block;
  vertical-align: middle;
  color: #333;
  line-height: 1;
  position: relative;
  width: 1.15em;
  height: 1.15em;
}

.dli-box-in::before {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 0.46em;
  border: 0.1em solid currentColor;
  border-top: 0;
  border-radius: 0 0 0.15em 0.15em;
  box-sizing: border-box;
}

.dli-box-in > span {
  position: relative;
  width: 0.1em;
  height: 0.625em;
  background: currentColor;
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.353em;
  margin: auto;
}

.dli-box-in > span::before {
  content: '';
  width: 0.40625em;
  height: 0.40625em;
  border: 0.1em solid currentColor;
  border-top: 0;
  border-right: 0;
  transform: rotate(-45deg);
  transform-origin: bottom left;
  position: absolute;
  left: 50%;
  bottom: -0.05em;
  box-sizing: border-box;
}