Improve contrast documentation for readability

[imme-emosol]

My browser is set to use different background-color & color.

Psalm's documentation seems to set a foreground-/text-color but not a background-color.

An example of what my browser shows:

[psalm-github-bot]

Hey @imme-emosol, can you reproduce the issue on https://psalm.dev ?

[imme-emosol]

Screenshot is after scrolling up from https://psalm.dev/docs/running_psalm/configuration/#projectfiles .

[weirdan]

psalm.dev sources are available at https://github.com/psalm/psalm.dev

I believe it can be fixed in https://github.com/psalm/psalm.dev/blob/master/assets/sass/mkdocs_material_extra.scss, feel free to submit a PR to that repo.

[imme-emosol]

Okay, thanks.

[imme-emosol]

It is actually in https://github.com/squidfunk/mkdocs-material/blob/fbfb66258802d0bd64020d951e401976fcc55179/src/assets/stylesheets/main/_typeset.scss#L47 .