* {
    box-sizing: border-box;
}

html,
body {
    height: 100vh;
    padding: 0;
    margin: 0;
    background-color: hsla(0, 0%, 25%, 0.8);
}

#logo {
    position: absolute;
    margin-top: 1rem;
    margin-left: 1rem;
}

#bg {
    width: 100vw;
    height: 100vh;
    background-color: rgb(64, 64, 64);
    background-position: center;
    background-repeat: no-repeat;
    background-size: 210vh 140vh;
    animation-delay: 1s;
    animation-direction: alternate;
    animation-duration: 5s;
    animation-fill-mode: both;
    animation-iteration-count: infinite;
    animation-name: background-move;
    animation-timing-function: ease-in-out;
}

@keyframes background-move {
    from {
        background-position: top left;
    }
    to {
        background-position: bottom right;
    }
}