4-color linear gradient. Flat CSS -- what's pictured above is exactly what you copy, no curve, distortion, or mesh effects hidden in it.
Looking for a full styled background instead? Browse free wallpapers →
background: linear-gradient(90deg, #06141B 0.0%, #11485E 33.3%, #4E9B7F 66.7%, #8FE3C7 100.0%);