.header {
    display: grid;
    grid-template-columns:
        minmax(var(--grid-padding), 1fr) repeat(
            var(--grid-columns),
            minmax(0, calc(var(--max-content-width) / var(--grid-columns)))
        )
        minmax(var(--grid-padding), 1fr);
}

.header > * {
    grid-column: 2/-2;
}

.header {
    position: relative;
    width: 100%;
    background-color: var(--clr-white);
}

.header::after {
    grid-column: 2 / -1;
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 1.25rem;
    background-color: var(--clr-primary);
    border-top-left-radius: 1.25rem;
    z-index: 1;
}

.header--fixed {
    position: fixed;
    top: 0;
    left: 0;
    z-index: var(--z-fixed);
}