:root {
    --max-width: 1000px;
}

body {
    display: flex;
    align-items: center;
    flex-direction: row;
    height: 100dvh;
    overflow: hidden;
    width: 100vw;
}

#left, #right {
    flex: 1 1 auto;
    height: 100dvh;
    background: repeating-linear-gradient(
        -20deg,
        var(--background-color), var(--background-color) 5px,
        var(--stripe-color) 5px, var(--stripe-color) 10px);
}

#middle {
    flex: 1 1 auto;
    width: 100%;
    max-width: var(--max-width);
}