.mask {
    background: rgba(0,0,0,.5);
}

.dialog{
    position: fixed;
    top: 50%;
    left: 50%;
    -webkit-transform: translate3d(-50%,-50%,0);
    transform: translate3d(-50%,-50%,0);
    background-color: #fff;
    width: 85%;
    border-radius: 3px;
    font-size: 16px;
    -webkit-user-select: none;
    overflow: hidden;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    -webkit-transition: .2s;
    transition: .2s;
}

.dialog_body {
    width: 100%;
    height: 100%;
    background-color: #ffffff;
    overflow: hidden;
}

.dialog_top {
    padding: 15px 0 0;
    
    color: #000;
    text-align: center;
    box-sizing: border-box;
}

.dialog_main {
    text-align: center;
    line-height: 36px;
    min-width: 36px;
    color: #999;
    width: 100%;
    box-sizing: border-box;
    border-bottom: 1px solid #ddd;
    padding: 10px 20px 15px
}

.dialog_bottom {
    color: #333333;
    height: 40px;
    line-height: 40px;
}

.dialog_bottom button{
    float: left;
    display: block;
    outline: none;
    background-color: #fff;
    line-height: 40px;
    text-align: center;
    box-sizing: border-box;
    width: 50%;
    font-size: 16px;
    margin: 0;
    padding: 0;
    border: 1px solid transparent;
    -webkit-tap-highlight-color:rgba(0,0,0,0);
    -webkit-user-select: none;
    -moz-user-focus: none;
    -moz-user-select: none;
    -webkit-appearance:none;
}
.dialog_bottom button:nth-of-type(1){
    color: #4d9bfb;
    border-right: 1px solid #ddd;
}
.dialog_bottom .alert_btn button{
    width: 100%;
    border-right: none;
}