* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body,
#app {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #000;
}

iframe {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    border: none;
    display: block;
    background: #000;
}