+pre.src-sh:before{ content:'sh' }
+pre.src-bash:before{ content:'bash' }
+pre.src-emacs-lisp:before{ content:'Emacs Lisp' }
+pre.src-R:before{ content:'R' }
+pre.src-org:before{ content:'Org' }
+pre.src-c+:before{ content:'C++' }
+pre.src-c:before{ content:'C' }
+pre.src-html:before{ content:'HTML' }