1 自定义复选框

input[type="checkbox"]+label::before {
            content: '\a0';
            background: silver;
            /* content: '\2713';
            background: yellowgreen; */
            /* 不换行空格 */
            display: inline-block;
            vertical-align: .2em;
            width: .8em;
            height: .8em;
            margin-right: .2em;
            border-radius: .2em;
            text-indent: .15em;
            line-height: .65;
        }

  隐藏原来的复选框  
input[type="checkbox"] {
            position: absolute;
            clip: rect(0, 0, 0, 0);
        }

在它聚焦或禁用时改变它的样式

 input[type="checkbox"]:focus + label::before { 
box-shadow: 0 0 .1em .1em #58a; 
} 
input[type="checkbox"]:disabled + label::before {
background: gray; box-shadow: none; color: #555;
}

开关式按钮

  input[type="checkbox"] {
            position: absolute;
            clip: rect(0, 0, 0, 0);
        }
        input[type="checkbox"]+label {
            display: inline-block;
            padding: .3em .5em;
            background: #ccc;
            background-image: linear-gradient(#ddd, #bbb);
            border: 1px solid rgba(0, 0, 0, .2);
            border-radius: .3em;
            box-shadow: 0 1px white inset;
            text-align: center;
            text-shadow: 0 1px 1px white;
        }
        input[type="checkbox"]:checked+label,
        input[type="checkbox"]:active+label {
            box-shadow: .05em .1em .2em rgba(0, 0, 0, .6) inset;
            border-color: rgba(0, 0, 0, .3);
            background: #bbb;
        }
<input type="checkbox" id="awesome" />
    <label for="awesome">Awesome!</label>