Save edited template on computer

Hi guys,

I created my website a while ago (codrutamarin.com), and edited the theme to suit my needs at the time, uploaded everything, twitched a bit online.

I have one question (and sorry for it being very dumb): HOW do I backup my EDITED theme? is there a way to download just the theme (including any edits i’ve done) from WP? Am i missing smting, bc I dont see that option anywhere?

I backed up my content, but that just looks odd without the same framing.

Hope you get what I’m asking. Please help!