去掉content: "";input框不显示了，有替换的方法吗？

Question

去掉content: "";input框不显示了，有替换的方法吗？

input[type=radio]:before {
    position: absolute;
    top: 48%;
    content: "";
    width: 0.84rem;
    height: 0.84rem;
    margin-top: -0.36rem;
    display: inline-block;
    background: url(../images/icon_check.png) no-repeat;
    background-size: cover;
    text-decoration: none;
    border-radius: 0;
    -webkit-font-smoothing: antialiased;
    /*background-size: 0.8rem 0.8rem;*/
    -webkit-appearance:none;
    padding:0!important;
    margin-left:0!important;
    margin-right:0!important;
}
input[type=radio]:checked:before {
      background: url(../images/icon_check.png) no-repeat 0 100%;
    background-size:cover;
     -webkit-appearance:none;
    padding:0!important;
    margin-left:0!important;
    margin-right:0!important;
    height: 0.8rem;
}