navbar dark fixes

src/scss/_variables.scss

@@ -67,14 +67,14 @@ $blockquote-font-size: $font-size-base !default;
 
 // COLORS
 $min-contrast-ratio: 1.5 !default;
-$text-muted-opacity: .68 !default;
+$text-muted-opacity: .66 !default;
 $text-muted-light-opacity: .4 !default;
 
 $border-opacity: .16 !default;
 $border-dark-opacity: .24 !default;
 
 $light: #f0f3f6 !default;
-$dark: #26384a !default;
+$dark: #232e3c !default;
 
 $body-bg: $light !default;
 $body-color: $dark !default;
@@ -170,8 +170,8 @@ $colors: (
 
 
 // Dark mode
-$dark-mode-darken: darken($dark, 3%) !default;
-$dark-mode-lighten: lighten($dark, 3%) !default;
+$dark-mode-darken: darken($dark, 2%) !default;
+$dark-mode-lighten: lighten($dark, 2%) !default;
 $dark-mode-text: $light;
 
 // Borders
@@ -232,20 +232,6 @@ $size-values: (
   auto: auto
 ) !default;
 
-$grid-breakpoints: (
-  xs: 0,
-  sm: 33rem,
-  md: 48rem,
-  lg: 64rem,
-  xl: 75.25rem
-) !default;
-
-$container-max-widths: (
-  sm: 32.5rem,
-  md: 47.5rem,
-  lg: 64rem,
-  xl: 75.25rem
-) !default;
 
 $container-variations: (
   tight: 35rem,