Here you can find links to the Custom CSS that I’m using, or have used, on my micro.blog hosted blog. They’re nothing overly special, however, they may help you get started with your own customisation.
All you’ll need to do is copy the text in the desired CSS file from the Github links below, and paste it into the Edit CSS box. There are more instructions on the micro.blog Custom CSS help page
There are more to come soon, just working on some other colour schemes.