moving gradient background css code example
Example 1: Css gradient animations
Here a codePen with cool animations:
https://codepen.io/DevLorenzo/pen/ExgpvJM
Example 2: html css background linear-gradient
background: linear-gradient(#333, #333 50%, #eee 100%);
\\code for a basic gradient background
#grad {
background-image: linear-gradient(red, yellow);
}