.wp-block-post-navigation-link {
    align-items: stretch;
    display: flex;
    justify-content: stretch;
}

.wp-block-post-navigation-link > a {
    display: block;
    transition: all var(--anim-speed) var(--anim-ease);
    transition-property: background-color, color;
    width: 100%;
}

.wp-block-post-navigation-link > a:active {
    transition-duration: var(--anim-speed-instant);
}