how to apply linear gradient in css to background image code example

Example 1: css horizontal gradient background color

.foo {
	background-image: linear-gradient(red, blue);
}

Example 2: gradient css background

/*From bottom to top*/
background: rgb(166,166,166);
background: linear-gradient(0deg, rgba(166,166,166,1) 0%, rgba(255,255,255,1) 29%);