fix color

src/client/styles/scss/theme/nature.scss

@@ -62,7 +62,7 @@ html[dark] {
   $bgcolor-card: #f5f5f5;
 
   // Font colors
-  $color-global: black;
+  $color-global: $bgcolor-theme;
   $color-reversal: #eeeeee;
   $color-link: lighten($color-global, 20%);
   $color-link-hover: lighten($color-link, 20%);