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The random() function in CSS is an experimental feature (i.e., not supported in any browser) that returns a random numeric value or random choice among multiple values from a range you specify. It works the same as JavaScript’s Math.random function…

Math.random() is an API in JavaScript. It is a function that gives you a random number. The number returned will be between 0 (inclusive, as in, it’s possible for an actual 0 to be returned) and 1 (exclusive, as in, …

Here’s a quicky (there is a PHP version too):

var randomColor = Math.floor(Math.random()*16777215).toString(16);

See the Pen
Generate New Random Hex Color with JavaScript by Chris Coyier (@chriscoyier)
on CodePen.

If you’d prefer they are a bit more …