background: radial-gradient(#e66465, #9198e5);

background: radial-gradient(closest-side, #3f87a6, #ebf8e1, #f69d3c);

background: radial-gradient(circle at 100%, #333, #333 50%, #eee 75%, #333 75%);

background: radial-gradient(ellipse at top, #e66465, transparent),
            radial-gradient(ellipse at bottom, #4d9f0c, transparent);