#backGuide, #backGuide p {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    }
    #backGuide {
    display: none;
    position: fixed !important;
    background-color: rgba(0,0,0,.7);
    z-index: 9999;
    }
    #backGuide p {
    display: block;
    width: 300px;
    height: 263px;
    line-height: 80px;
    margin: auto;
    cursor: pointer;
    font-weight: bold;
    }