Widget Titles in Dark Mode have bad Contrast (v3.5)

[v0tti]

Is it just me or are the widget titles of the new dashboard in v3.5 pretty unreadable in dark mode? Especially the default "white on light grey" titles are pretty bad. They seem fine in light mode but the color gets faded when changing to dark mode.

Maybe the contrast can be tweaked a little bit?

[abhi1693]

There is an issue for this #12219