Reddit Enhancement Suite for Old Reddit on desktop. I dunno about mobile though since Apollo died. Source: 6 months ago

Have you tried old reddit with the RES extension? I'm not a fan of the way comments appear without the extension, but the extension boosts readability significantly. I can't stand reddit's design without it. Source: 7 months ago

It's a giant step backwards in site design. Discuit wastes an incredible amount of screen space in making the site look pretty. Scroll down a bit and you'll see that more than half of your screen is empty and there is very little submissions displayed. Look at https://old.reddit.com/ and see the difference between the two. (Or add Reddit Enhancement Suite https://redditenhancementsuite.com/ for an even better... Source: 6 months ago

We prefer platforms that are integrated to RES like Youtube, Souncloud, Bandcamp, ... Source: 9 months ago

Note: I will be linking any specific post I talk about, so it is advised to have downloaded the RES browser extension and be on old reddit if you want to look at the specific post/picture I'm referring to without opening a new page. Link to download. Source: 10 months ago

Check this site, has a lot of themes to choose from (and install using plugin) https://rainglow.io/. Source: almost 3 years ago

Looks like they have themes for other editors too. Source: about 3 years ago