diff --git a/share/tools/web_config/fishconfig.css b/share/tools/web_config/fishconfig.css
index d2eb8fc73..b93b541a5 100644
--- a/share/tools/web_config/fishconfig.css
+++ b/share/tools/web_config/fishconfig.css
@@ -5,7 +5,7 @@ body {
 }
 
 #ancestor {
-    width: 800px;
+    width: 80%;
     margin-left: auto;
     margin-right: auto;
     margin-top: 25px;