漸變上下左右

background-image: linear-gradient(-90deg, #D60503 0%, #FEE900 25%, #04FF7A 42%, #00DEFF 59%, #002CFF 72%, #FF007A 100%);    左右

 

background-image: linear-gradient(-180deg, #7969F7 4%, rgba(121,105,247,0.00) 100%);    上下