:root{--border-radius:75px}.round-corners.top_left{border-top-left-radius:var(--border-radius)}.round-corners.top_right{border-top-right-radius:var(--border-radius)}.round-corners.bottom_left{border-bottom-left-radius:var(--border-radius)}.round-corners.bottom_right{border-bottom-right-radius:var(--border-radius)}