set secondary to new blue

public/sass/_variables.dark.scss

@@ -159,8 +159,8 @@ $table-bg-hover: $dark-3;
 $btn-primary-bg: #ff6600;
 $btn-primary-bg-hl: #bc3e06;
 
-$btn-secondary-bg-hl: lighten($blue-dark, 5%);
-$btn-secondary-bg: $blue-dark;
+$btn-secondary-bg-hl: $sapphire-base;
+$btn-secondary-bg: $sapphire-shade;
 
 $btn-secondary-bg: $sapphire-base;
 $btn-secondary-bg-hl: $sapphire-shade;