The rendering of the quick panel is controlled by the theme (i.e., 'Theme - Default') rather than the colour scheme, the latter applies to the text views only.
If you open up the theme, (via Packages/Theme - Default/Default.sublime-theme), then the values that control the quick panel rendering are:
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Check that these are the values you're seeing. If you edit them and save the .sublime-theme file, they should be updated immediately.