H2O: Add a full-page background

Objective

Add a full-page background image to the H2O theme

Instructions

See: How to edit code files

1. Upload your background image to: yourforum.com/styles/H2O/theme/images/
2. Open: yourforum.com/styles/H2O/theme/palette.css
3. Find:
   

   /* Middle grey (dark bg) */
   

4. On a new line above, add:
   

   html, body {
       background-color: #171B24;
       background-image: url("./images/s0KDwM.jpg");
       background-repeat: repeat;
       background-position: left top;
       background-attachment: fixed;
   }
   
   .wrap {
       background: none !important;
   }
   

5. Edit the file path to background image
6. Edit the background CSS properties as desired
7. Purge cache

Result