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

iframe {
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    border: none;
    outline: none;
}