Logback ConsoleAppender supports color output using ANSI code but some consoles does not support it well and so print some crappy characters (like eclipse IDE console or some windows platform ):

[main] [34mINFO [0;39m [36mo.e.l.s.d.Server[0;39m - Web server started at http://0.0.0.0:8080/. 

This makes this feature hard to use because you should accept to be ugly in some conditions to be pretty in others. The trade-off doesn't seem worthy.

A solution could be to add some heuristic to know if logback should use ANSI code or not.
You could have a look at the way picocli do it : https://github.com/remkop/picocli/issues/512#issuecomment-429170587

If you're not so confident because you don't want to break behavior of ConsoleAppender, you could begin with an other ConsoleAppender.