open-consul/ui/packages/consul-ui/app/styles/base/icons/base-placeholders.scss

%with-icon {
  background-repeat: no-repeat;
  background-position: center;
}
%with-mask {
  mask-repeat: no-repeat;
  mask-position: center;
  background-color: currentColor;
}
%with-glyph-icon {
  font-weight: $typo-weight-normal;
  background-color: $gray-100;
  visibility: visible;
  padding: 0 4px;
}
%as-pseudo {
  display: inline-block;
  content: '';
  visibility: visible;
  background-size: contain;
  width: 1.2em;
  height: 1.2em;
  vertical-align: text-top;
}
%led-icon {
  position: relative;
  box-sizing: border-box;
  width: 12px;
  height: 12px;
}
%led-icon::after,
%led-icon::before {
  content: '';
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 100%;
}
%led-icon::before {
  border: 1px solid currentColor;
  opacity: 0.5;
}
%led-icon::after {
  position: absolute;
  top: 2px;
  left: 2px;
  width: calc(100% - 4px);
  height: calc(100% - 4px);
  background-color: currentColor;
}