body, html {
    position: relative;
    margin: 0;
    padding: 0;
}

.container {
    display: block;
    position: fixed;
    width: 100%;
    margin: 0 auto;
    height: 100%;
    top: 0;
    left: 0;
}

.container h1, .container iframe {
    display: block;
    width: 100%;
}

.container iframe {
    display: block;
    position: absolute;
    height: 100%;
    top: 0;
    left: 0;
}

.container h1 {
    margin-bottom: 15px;
    margin-top: 50px;
}