实现一个网页按钮

 <label class="switch">
            <input type="checkbox" checked="checked">
            <span class="slider"></span>
   </label>

/* 开关按钮的input元素的样式 */
.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

/* 开关按钮的滑块的样式 */
.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    -webkit-transition: .4s;
    transition: .4s;
    border-radius: 34px;
}

/* 开关按钮的滑块的样式当选中时 */
.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    -webkit-transition: .4s;
    transition: .4s;
    border-radius: 50%;
}

/* 开关按钮的input元素选中时的样式 */
input:checked + .slider {
    background-color: #2196F3;
}

/* 开关按钮的input元素选中时滑块的样式 */
input:checked + .slider:before {
    -webkit-transform: translateX(26px);
    -ms-transform: translateX(26px);
    transform: translateX(26px);
}