.demo-shade{
            background: rgba(0,0,0,0.5);
            width: 100%;
            height: 100%;
            position: fixed;
            top: 0;
            z-index: 900;
            display:none;
        }
        .demo-iframe{
            position:fixed;
            z-index: 1000;
            border: 12px solid #fff;
            display:none;
            background: #fff;
        }
        .demo-close{
            position:fixed;
            z-index:1050;
            color:#fff;
            right:0;
            cursor:pointer;
    font-size: 54px;
    background: #555;
    border-radius: 45px;
    width: 80px;
display: flex;
    align-items: center;
    justify-content: center;
        }
        .demo-close .fa{
            padding: 6px 12px 9px;
            background: #dfdfdf;
            color: #575757;
            border-radius: 45px;
            font-size: 42px;
        }