CSS Gradients

linear-gradient(#e66465, #9198e5);

linear-gradient(0.25turn, #3f87a6, #ebf8e1, #f69d3c);

linear-gradient(217deg, rgba(255,0,0,.8), rgba(255,0,0,0) 70.71%), linear-gradient(127deg, rgba(0,255,0,.8), rgba(0,255,0,0) 70.71%), linear-gradient(336deg, rgba(0,0,255,.8), rgba(0,0,255,0) 70.71%);

linear-gradient(to right, red 20%, orange 20% 40%, yellow 40% 60%, green 60% 80%, blue 80%)

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

radial-gradient(farthest-corner at 40px 40px, #f35 0%, #43e 100%);

conic-gradient(red, orange, yellow, green, blue);

https://developer.mozilla.org/en-US/docs/Web/CSS/gradient/linear-gradient()

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