Pick two colors, choose linear / radial / conic, then dial in the easing curve. ColorUI interpolates in OKLCH so mid-tones stay clean - no muddy bands.
background: linear-gradient(135deg, #7c5cff 0.00%, #5f80ff 25.00%, #35a0ff 50.00%, #00bcff 75.00%, #00d4ff 100.00%);
background: linear-gradient(in oklch 135deg, #7c5cff, #00d4ff);