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It's easy to create a rainbow in CSS using linear-gradient.
#grad1 {
height: 200px;
background: linear-gradient(45deg, red, orange, yellow, green, blue, indigo, violet, red);
}<div id="grad1"></div>But look at it! This gradient is aesthetically horrifying. It's streaky, there's ugly strips of pure colour where the endpoints meet, it doesn't loop very well, it's not smooth, and the colours clearly contrast against each other when they should seamlessly blend.
In short: it's a terrible gradient.
I'd like to find the perfect gradient. One that encompasses the rainbow in a slick, smooth way, one that doesn't leave any obvious bumps or visual tearing. Instead of a spiky mess, this gradient is a smooth curve.
Does this gradient exist?
920
You need to choose colors that will blend nicely together and more color steps.
background: linear-gradient(90deg, rgba(255,0,0,1) 0%, rgba(255,154,0,1) 10%, rgba(208,222,33,1) 20%, rgba(79,220,74,1) 30%, rgba(63,218,216,1) 40%, rgba(47,201,226,1) 50%, rgba(28,127,238,1) 60%, rgba(95,21,242,1) 70%, rgba(186,12,248,1) 80%, rgba(251,7,217,1) 90%, rgba(255,0,0,1) 100%);
.rainbow-box {
width: 80vw;
height: 200px;
border-radius: 5px;
background: linear-gradient(
90deg,
rgba(255, 0, 0, 1) 0%,
rgba(255, 154, 0, 1) 10%,
rgba(208, 222, 33, 1) 20%,
rgba(79, 220, 74, 1) 30%,
rgba(63, 218, 216, 1) 40%,
rgba(47, 201, 226, 1) 50%,
rgba(28, 127, 238, 1) 60%,
rgba(95, 21, 242, 1) 70%,
rgba(186, 12, 248, 1) 80%,
rgba(251, 7, 217, 1) 90%,
rgba(255, 0, 0, 1) 100%
);
}<div class="rainbow-box"></div>
I made it using CSS gradient generator: https://cssgradient.io/
107
You can get something that looks better by overlaying the individual red, green, and blue colours, trying to match the human colour cone sensitivities.
Here's an example, but it could be improved by adjusting some of the % numbers in the linear-gradients, and by having smother gradient shapes (currently triangles with cut-off tops).
<!DOCTYPE html>
<html>
<head>
<title>Rainbow</title>
<meta charset="UTF-8" />
<style>
* { box-sizing: border-box; }
.separate { width: 100%; height: 10em; }
.separate>* { width: 100%; height: 100%; margin-top: 1em; }
.overlay { width: 100%; height: 10em; filter: brightness(3); }
.overlay>* { width: 100%; height: 100%; position: absolute; }
.overlay>:nth-of-type(1) { opacity: 1; }
.overlay>:nth-of-type(2) { opacity: .5; }
.overlay>:nth-of-type(3) { opacity: .33; }
.overlay>:nth-of-type(4) { opacity: .25; }
.blue { background: linear-gradient(
90deg, rgb(0,0,256) 0%, rgb(0,0,256) 5%, rgb(0,0,0) 20% ); }
.green { background: linear-gradient(
90deg, rgb(0,0,0) 0%, rgb(0,256,0) 25%, rgb(0,256,0) 35%, rgb(0,0,0) 55% ); }
.red { background: linear-gradient(
90deg, rgb(0,0,0) 15%, rgb(256,0,0) 35%, rgb(256,0,0) 45%, rgb(0,0,0) 100% ); }
.blue2 { background: linear-gradient(
90deg, rgb(0,0,0) 65%, rgb(0,0,256) 95%, rgb(0,0,256) 100% ); }
</style>
</head>
<body>
<h1>Rainbow</h1>
<div class="overlay">
<div class="blue"></div>
<div class="green"></div>
<div class="red"></div>
<div class="blue2"></div>
</div>
<div class="separate">
<div class="blue"></div>
<div class="green"></div>
<div class="red"></div>
<div class="blue2"></div>
</div>
</body>
</html>
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