How can I make the background change colour(Animation)?

Question

https://code.sololearn.com/WsUydavTSYyR/?ref=app

Answer 1

//JS, this? :

onload=function(){setInterval(function(){document.body.style.backgroundColor='#'+Math.round(Math.random()*16777215).toString(16)},2000)}

Answer 2

I see you have already got brilliant answers.
I'll have to save Valentin's answer for later ^^
Here is one more option:
https://code.sololearn.com/WlGsE8XAibIe/?ref=app

Answer 3

you can refer this code

https://code.sololearn.com/WHE0GtrKfoel/?ref=app

Answer 4

https://code.sololearn.com/WwmdRZrw4VbG/?ref=app

Answer 5

Thank you all