Make code block styles more readable

The code block styles have a rather low contrast ratio between font color and background color. Also, the style doesn't really fit in with the new look anymore.

[Old description:]

I noticed that I personally find the inline codes in the community solutions a bit hard to read sometimes. On one hand this is because the contrast ratio is rather low and the font weight rather small. On the other hand, red usually stands for an alert or an error ("danger" color).

I'd advocate for using a less jarring color with a better contrast ratio or adding a background color like with the code-block. Copying what Gitlab does with their inline code would also be a good idea.