Linear-gradient are often used to make gradients, such as
(color slag, I would like to find a color example)
The CSS code is as follows
Background:linear-gradient (45deg, #ff0000 0, #ffb600 11%, #fff600 22%, #a5ff00 33%, #00a9ff 44%, #0400ff 55%, #8a00fc 66%,# Ff00e9 77%, #ff0059 88%, #ff0000 100%);
If you want to make stripes, it's easy.
Background:linear-gradient (45deg, #ff0000 0, #ff0000 11%, #ffb600 11%, #ffb600 22%, #fff600 22%, #fff600 33%, #a5ff00 33%, #a5ff00 44%, #00a9ff 44%, #00a9ff 55%, #0400ff 55%, #0400ff 66%, #8a00fc 66%, #8a00fc 77%, #ff00e9 77%, #ff00e9 88%, #ff0000 88%, #ff0000 100%);
Effect
Radial Empathy
Background:radial-gradient (#ff0000 0, #ff0000 11%, #ffb600 11%, #ffb600 22%, #fff600 22%, #fff600 33%, # A5ff00 33%, #a5ff00 44%, #00a9ff 44%, #00a9ff 55%, #0400ff 55%, #0400ff 66%, #8a00fc 66%, #8a00fc 77%, # Ff00e9 77%, #ff00e9 88%, #ff0000 88%, #ff0000 100%);
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CSS3 Gradient Rainbow Stripe