.icon {
  display: inline-block;
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
  color: inherit;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: -0.15em;
}

.icon use {
  fill: none;
  stroke: currentColor;
}

.icon-sm {
  width: 16px;
  height: 16px;
}

.icon-md {
  width: 20px;
  height: 20px;
}

.icon-lg {
  width: 24px;
  height: 24px;
}

.icon-empty {
  width: 56px;
  height: 56px;
  stroke-width: 1.75;
}