Hi, I'm very experienced at HTML and CSS, but only just beginning to learn PHP, and I have just installed Trellis Desk on my website. I would like to remove the
trellis/images/default/header.jpg
code and instead use a background image in the header's CSS, but I can't work out which file I should be editing. I know there are .tpl files (which I am familiar with) but I don't think any of them are involved in producing the index.php page, but I could be wrong.
Many thanks in advance for any help you can offer.