ant-design/style/mixins/iconfont.less

.iconfont-mixin() {
  position: relative;
  display: inline-block;
  font-style: normal;
  vertical-align: baseline;
  text-align: center;
  text-transform: none;
  text-rendering: auto;

  &:before {
    display: block;
    font-family: "anticon" !important;
  }
}