默认checkbox样式修改

input[type="checkbox"]{
    width: 16px;
    height: 16px;
    background-color: #fff;
    -webkit-appearance: none;
    border: 1px solid #22bcee;
    border-radius: 2px;
    outline: none;
    box-sizing: border-box;
}
input[type=checkbox]:checked{
    background: url(../../img/checked2.png) no-repeat center center;
    background-size: 100% 100%;
}