:privTri: Volpeon :areon3NSmol: (@volpeon)

I figured out how to implement a footer that's also at the bottom of the viewport if the page isn't tall enough:

html {
    min-block-size: 100%;
    display: flex;
}

body {
    inline-size: 100%;
}

.footer {
    position: sticky;
    inset-block-start: 100%;
}