darker fg/text colour

Paper/gtk-3.0/gtk.css

@@ -23,7 +23,7 @@
 /* Base colors */
 @define-color base #fff;/* Base color */
 @define-color background #f7f7f7;/* Background color */
-@define-color foreground #666;/* Foreground color */
+@define-color foreground #333;/* Foreground color */
 @define-color border #D8D8D8;/* Borders color */
 @define-color separator alpha(#000, 0.15);/* Separator color */
 @define-color text @foreground;/* Text color */

Paper/gtk-3.16/_colors.scss

@@ -4,7 +4,7 @@
 // Main definitions
 $base_color: if($variant == 'light', #ffffff, #636E73);
 $bg_color: if($variant == 'light', #f7f7f7, #4F585C);
-$fg_color: if($variant == 'light', #666666, lighten(#A1A8AB, 10%));
+$fg_color: if($variant == 'light', #333, lighten(#A1A8AB, 10%));
 $text_color: if($variant == 'light', $fg_color, $fg_color);
 $headerbar_bg_color: if($variant == 'light', #636E73, #3B4245);
 $headerbar_fg_color: if($variant == 'light', #ffffff, transparentize(#ffffff, 0.5));

Paper/gtk-3.18/_colors.scss

@@ -4,7 +4,7 @@
 // Main definitions
 $base_color: if($variant == 'light', #ffffff, #636E73);
 $bg_color: if($variant == 'light', #f7f7f7, #4F585C);
-$fg_color: if($variant == 'light', #666666, lighten(#A1A8AB, 10%));
+$fg_color: if($variant == 'light', #333, lighten(#A1A8AB, 10%));
 $text_color: if($variant == 'light', $fg_color, $fg_color);
 $headerbar_bg_color: if($variant == 'light', #636E73, #3B4245);
 $headerbar_fg_color: if($variant == 'light', #ffffff, transparentize(#ffffff, 0.5));

Paper/gtk-3.20/_colors.scss

@@ -4,7 +4,7 @@
 // Main definitions
 $base_color: if($variant == 'light', #ffffff, #636E73);
 $bg_color: if($variant == 'light', #f7f7f7, #4F585C);
-$fg_color: if($variant == 'light', #666666, #A1A8AB);
+$fg_color: if($variant == 'light', #333, #A1A8AB);
 $text_color: if($variant == 'light', $fg_color, $fg_color);
 $headerbar_bg_color: if($variant == 'light', #636E73, #3B4245);
 $headerbar_fg_color: if($variant == 'light', #ffffff, transparentize(#ffffff, 0.2));