What is the code to blend colors fo a cool affect?

Answer 1

You can add a css rule like "transition: background-color 2s;" to enable a smooth transition of background colours. Then you can change the background colour every 2 seconds using javascript element.style DOM manipulation and use setInterval to repeat the changing colours.

Check this code, I made it exactly how you want it: http://www.sololearn.com/app/javascript/playground/W1scye9JMt3i/

Answer 2

use css animation with gradients