html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    width: 100%;
}

#content-container {
    position: absolute;

    height: 240px;
    width: 100%;

    top:0;
    bottom:0;
    left:0;
    right: 0;

    margin: auto;
}

#fullscreen-btn{
    position: fixed;

    bottom: 0;
    right: 0;
}

#menu-selecter {
    position: fixed;
    top: 0;
    right: 0;
    margin: 5px;
}