Improve contrast of badges on dark backgrounds

[simurai]

Problem: When using a .badge on a background from a dark syntax theme, contrast suffers.

Solution: Change the @background-color-selected variable to not use transparency.

It won't look as subtle, but at least it's readable.

Concerns: I think initially, transparency was used to make it more flexible with different backgrounds, but that only works when they are light too.

[matthewwithanm]

I don't think it's quite that simple…the "hi" message in the example uses .highlight-info.

[simurai]

Right.. the .highlight classes also shouldn't use transparency. Should be fixed in 1.12.

[matthewwithanm]

Thanks! ❤️