How can I add a gif as my entire background on the Dawn theme?

[Iyonnasherman]

Hey I will be more than happy if someone could help with the coding for my background on my dawn theme.

I’m trying to add a gif as my entire background for my site. 

I’m just a little confused because I’ve added the coding to my liquid asset but it isn’t showing up on my website.  Any tips? Or maybe I’m not up to date with the correct coding for this theme. 

or maybe I must choose a new theme 

[Iyonnasherman]

background-image:url('https://cdn.shopify.com/s/files/1/0680/1647/2377/files/lighteening_background.gif?v=1668396923');
background-size: contain;
background-repeat: repeat-y;
background-attachment: fixed;
height: 100%;
width: 100%;

this is essentially the coding I’ve used. Maybe I’m placing it in the wrong liquid asset or area