body {
    overflow-x: hidden;
    margin: 0;
}

#background {
    position: absolute;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    background-image: url(pics/xpbg.png);
    background-size: cover;
    background-position: center;
}

header {
    position: absolute;
    width: 260px;
    text-align: center;
    top: 45px;
    left: calc(50vw - 130px);
    z-index: 1;
}

iframe {
    position: relative;
    width: 567px;
    height: 485px;
    display: block;
    margin: auto;
    padding-top: 188px;
    z-index: 2;
}