[my_iframe]
{
    display:none;
    position: fixed;
    top: 50px;
    width: -webkit-fill-available;
    height:-webkit-fill-available;
    z-index: 999;
    
    border: 5px dashed orange;
    padding: 5px;
    margin: 5px;
    overflow: auto;
    background-color: #333;
}