Different background color for markdown inline <code> blocks

[josephrocca]

Here's what `code` blocks currently look like in README files:

I think something like this is much more readable:

In that example I've just added these 3 lines to the .prose code CSS block:

background-color: #e6e6e6;
border-radius: 2px;
padding: 0.05rem 0.2rem;

[julien-c]

WDYT @gary149?

[gary149]

I agree this is more readable 👍 . The background is a bit too dark but that's fine-tuning. @mishig25 can probably take a look at this (we need to be careful with the CSS cascading to not break anything).

[krampstudio]

This have been fixed now