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

@keyframes slide {
    from {
        background-position: bottom;
    }
    to {
        background-position: top;
    }
}

body {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    background-size: 100% 125%;
    background-position: bottom;
    animation: slide 0.1s linear;
}

body > * {











































    width: 100%;
    flex: 1;
}