* {
    margin: 0;
    padding: 0;
    /* 触摸行为 */
    touch-action: none;
}
 #container {
    width: 100%;
    position: relative;
 }

 #under {
    width: 90%;
    height: 500px;
    text-align: center;
    line-height: 500px;
    background: #eee;
    margin: 30px auto 1000px;
 }
 #dialog {
    width: 80%;
    background: #fff;
    height: 240px;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -120px;
    margin-left: -40%;
    z-index: 99;
 }

 #title {
    width: 100%;
    height: 200px;
    line-height: 200px;
    text-align: center;
 }
#action {
    position: absolute;
    bottom: 30px;
    left: 34%;
}
 #close {
    border: 0;
    width: 100px;
    height: 35px;
    background: #00f;
    color: #fff;
 }
 #mask {
    width: 100%;
    background: rgba(0,0,0,.5);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
 }