1. label:before {
    2.   display: inline-block;
    3.   margin-right: 4px;
    4.   color: #f5222d;
    5.   font-size: 13px;
    6.   font-family: SimSun, sans-serif;
    7.   line-height: 1;
    8.   content: "*";
    9. }