update palette

Author: haschek

src/configuration/_palettes.scss

@@ -9,7 +9,7 @@ $eccgui-color-palette-light: (
         "brand": eccgui-create-color-tints(#fbead9 #f8cd99 #f6b966 #f4a533 #f29100),
         "accent": eccgui-create-color-tints(#e5f4fb #aecfe3 #77abca #4186b2 #0a6199),
         "text": eccgui-create-color-tints(#f8f8f8 #bcbcbc #818181 #434343 #090909),
-        "background": eccgui-create-color-tints(#fff #e8e8e8 #d6d6d6 #d4d4d4 #d3d3d3),
+        "background": eccgui-create-color-tints(#fff #e8e8e8 #d6d6d6 #bfbfbf #a6a6a6),
     ),
     "semantic": (
         "info": eccgui-create-color-tints(#e5f4fb #aecfe3 #77aaca #4086b2 #096199),