html, body
{
    padding: 0;
    margin: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: #000;
}

iframe {
    border: 0 none;
    width: 100%;
    height: 100%;
    max-width: 75vh;
    margin: auto;
    display: block;
}