Using CSS gradients - CSS: Cascading Style Sheets | MDN
https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Images/Using_CSS_gradients
CSS gradients are represented by the <gradient> data type, a special type of <image> made of a progressive transition between two or more colors. You can choose between three types of gradients: linear (created with the linear-gradient () function), radial (created with the radial-gradient () function), and conic (created with the conic-gradient () function).
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