diff --git a/src/ui/css/diff2html.css b/src/ui/css/diff2html.css
index e604924..f133b01 100644
--- a/src/ui/css/diff2html.css
+++ b/src/ui/css/diff2html.css
@@ -5,7 +5,8 @@
  *
  */
 
-:root {
+:root,
+:host {
   --d2h-bg-color: #fff;
   --d2h-border-color: #ddd;