background: linear-gradient(to right, #57c1eb 0%, #246fa8 100%); code example
Example 1: css horizontal linear gradient
background: linear-gradient(to left, red, blue);Example 2: css linear gradient
#gradient {
background-image: linear-gradient(180deg, black, red);
}
/* can be applied in many places, as your <body> background or a <div> etc */