修改复选框的样式

参考 https://www.cnblogs.com/wush-1215/p/9810993.html

input[type="checkbox"] {
    width: 12px;
    height: 12px;
    display: inline-block;
    text-align: center;
    vertical-align: middle;
    line-height: 12px;
    position: relative;
}

input[type="checkbox"]::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    background: #fff;
    width: 100%;
    height: 100%;
    border: 1px solid #CACDCF
}

input[type="checkbox"]:checked::before {
    content: "\2713";
    background-color: #2196F3;
    color: #fff;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    border: 1px solid #2196F3;
    font-size: 12px;
    font-weight: bold;
}

原文地址：https://www.cnblogs.com/hyx626/p/10740415.html