linear-gradient(hex, hex) it also works with many other things like circle gradients. (radial-gradient)

You copy the gradient from here and paste it into the color box.

ex : linear-gradient(0deg,rgba(53, 48, 118, 1) 0%, rgba(255, 255, 255, 1) 29%, rgba(255, 255, 255, 1) 72%, rgba(237, 218, 219, 1) 100%)