how to apply gradient color in css code example

Example 1: gradient image css

#show_bg_2 {
 
background-image:
  /*two color gradient over an image*/
linear-gradient(to bottom, rgba(245, 246, 252, 0.52), 
rgba(117, 19, 93, 0.73)),url('images/background.jpg');
 
width: 80%;
height: 400px;
background-size: cover;
}

Example 2: css horizontal linear gradient

background: linear-gradient(to left, red, blue);

Example 3: linear-gradient

background: linear-gradient(to left, #333, #333 50%, #eee 100%);

Example 4: css gradient

Here a codePen with cool gradient animations:
https://codepen.io/DevLorenzo/pen/ExgpvJM