gistfile1.txt

// reset icon; this is recommended properties
.icon {
  fill: currentColor;
  height: 1em;
  overflow: hidden;
  vertical-align: -.15em;
  width: 1em;
}

// icon size; use font-size
.icon-medium {
  @include sq-font-size(5)
}

// icon color
.icon-red {
  color: #cc0000;
}