kill the :cssclass option

lib/banzai/filter/syntax_highlight_filter.rb

@@ -44,8 +44,7 @@ module Banzai
       # Override Rouge::Plugins::Redcarpet#rouge_formatter
       def rouge_formatter(lexer)
-        Rouge::Formatters::HTMLGitlab.new(
-          cssclass: "code highlight js-syntax-highlight #{lexer.tag}")
+        Rouge::Formatters::HTMLGitlab.new
       end
     end
   end

lib/gitlab/highlight.rb

@@ -48,7 +48,6 @@ module Gitlab
     def rouge_formatter(options = {})
       Rouge::Formatters::HTMLGitlab.new(
-        cssclass: 'code highlight',
         lineanchors: true,
         lineanchorsid: 'LC'
       )

lib/rouge/formatters/html_gitlab.rb

@@ -17,11 +17,9 @@ module Rouge
       #                     be changed with lineanchorsid to e.g. foo-linenumber
       #                     (default: 'L').
       def initialize(
-          cssclass: 'highlight',
           lineanchors: false,
           lineanchorsid: 'L'
       )
-        @cssclass = cssclass
         @lineanchors = lineanchors
         @lineanchorsid = lineanchorsid
       end