.model_wrap{
    width: 100%;
    height: 100vh;
    background-color: #000;
    opacity: 0.5;
    position: fixed;
    top: 0;
    display:none;
    z-index:999;
}
.model{
    width: 1200px;
    height: 644px;
    position: absolute;
    top: calc(50% - 322px);
    left: 50%;
    margin-left: -600px;
    background-color: #fff;
}