/* Constants. */
:root {
    /* Core Constants. */
    --standard-margin: 20px;
    --standard-padding: 20px;
    --standard-border-radius: 4px;
    --logo-size: 64px;
    --logo-font-size: xx-large;
    --title-font-size: x-large;

    /* Derived variables. */
    --header-height: calc(var(--logo-size) + 2 * var(--standard-margin));
}