[devdocsgjs/main: 1010/1867] Use dark-mode native UI elements in dark mode where supported

[Andy Holmes <andyholmes src gnome org>]

commit 6d8a44369c32bd999647ac1f4f4c46c67a10e6c7
Author: Jed Fox <git twopointzero us>
Date:   Mon Jan 13 16:17:23 2020 -0500

    Use dark-mode native UI elements in dark mode where supported

 assets/stylesheets/global/_base.scss | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/assets/stylesheets/global/_base.scss b/assets/stylesheets/global/_base.scss
index b81d5a93..ec7be4f2 100644
--- a/assets/stylesheets/global/_base.scss
+++ b/assets/stylesheets/global/_base.scss
@@ -10,6 +10,13 @@ html {
   @import 'global/print';
 }
 
+html._theme-default {
+  color-scheme: light only;
+}
+html._theme-dark {
+  color-scheme: dark only;
+}
+
 body {
   height: 100%;
   margin: 0;