Improves detection of WP Version, Plugins etc by checking 404

app/finders/main_theme/css_style_in_404_page.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+module WPScan
+  module Finders
+    module MainTheme
+      # From the CSS style in the 404 page
+      class CssStyleIn404Page < CssStyleInHomepage
+        def passive(opts = {})
+          passive_from_css_href(target.error_404_res, opts) || passive_from_style_code(target.error_404_res, opts)
+        end
+      end
+    end
+  end
+end