Final answer:
To create a gradient background in CSS, use the 'background' property with the 'linear-gradient()' or 'radial-gradient()' functions, specifying at least two color stops.
Step-by-step explanation:
To set a background color gradient using CSS, you use the background property and the linear-gradient() function. You can define a gradient by specifying at least two color stops in the function. The gradient can be customized by changing the direction and how the colors are distributed within the gradient.
Example of a Simple Linear Gradient:
body {
background: linear-gradient(to right, red, blue);
}
This will create a horizontal gradient that transitions from red to blue from left to right. You can also create radial gradients using the radial-gradient() function. By experimenting with these functions, you can achieve a wide variety of gradient effects.