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

#video {
    background-image: url('/willpower.gif');
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    height: 100%;
}

.modal.background {
    z-index: 10;
    background-image: url('/tip.jpg');
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    height: 100%;
}

.modal.content {
    
}