html { 

        height:100%; 

        overflow:hidden; 

    }

    .bg_youtube { 

        text-align:center; 

        height:100%; 

        min-height:100%; 

        position:relative; 

        overflow:hidden; 

    }

    .container { 

        color:white; 

        position:absolute; 

        top:50%; 

        left:50%; 

        border:1px solid white; 

        width:300px; 

        height:300px; 

        margin-top:-130px; 

        margin-left:-225px; 

        font-family:arial, sans-serif; 

    }