amis/scss/components/form/_rating.scss

.#{$ns}Rating {
  position: relative;
  overflow: hidden;
  display: block;
  float: left;
  font-size: px2rem(24px);
  color: $dark;
  cursor: pointer;

  &.is-active {
    color: $info;
  }

  &.is-disabled {
    cursor: not-allowed;
  }

  &-half:before {
    position: absolute;
    overflow: hidden;
    display: block;
    z-index: 1;
    top: 0;
    left: 0;
    width: 50%;
    content: attr(data-forhalf);
    color: $info;
  }
}

.#{$ns}RatingControl {
  position: relative;
  overflow: hidden;
}