diff --git a/src/css/options.css b/src/css/options.css
index 5a6baf0f..1b9f97a0 100644
--- a/src/css/options.css
+++ b/src/css/options.css
@@ -1,3 +1,8 @@
+:root {
+  /* Opt UI chrome such as form controls into user's color scheme. */
+  color-scheme: light dark;
+}
+
 body {
   --grey10: #e7e7e7;