Tweak dark theme colors

assets/stylesheets/global/variables-dark.scss

@@ -10,8 +10,8 @@ $sidebarMediumWidth: 16rem;
 $contentBackground: #2d2d2d;
 
 $textColor: #c9c9c9;
-$textColorLight: #7e7d7d;
-$textColorLighter: #6a6868;
+$textColorLight: #858585;
+$textColorLighter: #706f6f;
 
 $inputFocusBorder: #444;
 
@@ -65,7 +65,7 @@ $noteOrangeBackground: #3e271d;
 $noteOrangeBorder: #1f1511;
 
 $noteRedBackground: #3e1b1b;
-$noteRedBorder: #1b0a0a;
+$noteRedBorder: #170808;
 
 $labelBackground: #38383a;