.sb-spacer {
    width: 100%;
    display: block;
}

/* the "space" is the actual height */
.sb-spacer__space {
    width: 100%;
    height: 0;
}

/* line defaults */
.sb-spacer__hr {
    margin: 0;
    width: auto;
    border: 0;
    border-top: 1px solid var(--bs-border-color, rgba(0,0,0,.12));
    opacity: 0.2;
}

/* dark-mode friendly fallback if bs vars aren't applied yet */
@media (prefers-color-scheme: dark) {
    .sb-spacer__hr {
        border-top-color: var(--bs-border-color, rgba(255,255,255,.18));
    }
}