Changing the site name color also changes messages colors.

[herbdool]

Describe your issue or idea

Steps to reproduce (if reporting a bug)

1. Edit theme to change color of the site name.
2. Edit or add a node and save.

Actual behavior (if reporting a bug)

Changing the site name color also changes messages colors. Instead of being green the message showed up red.

Expected behavior (if reporting a bug)

Confirmation messages like "Page saved" should show up as green.

Relevant version/system information (if applicable)

1.11.0 release candidate

[quicksketch]

Nice find and fix! Thanks @herbdool and @hosef! Merged backdrop/backdrop#2297 into 1.x for 1.11.0.