Merge branch 'fix' into 'pregmod-master'

fix big slave picture dark gradient in light theme

Closes #2078

See merge request pregmodfan/fc-pregmod!7446

themes/light/main.css

+.lrgRender > div.mask, .lrgVector > div.mask {
+	background: linear-gradient(90deg, rgba(255, 255, 255, 1), rgba(255, 255, 255, 0.8) 60%, rgba(255, 255, 255, 0));
+}