Fix preview of themes / custom css
Fix preview of themes / custom css

pferreir/indico,mvidalgarcia/indico,OmeGak/indico,ThiefMaster/indico,mvidalgarcia/indico,DirkHoffmann/indico,mic4ael/indico,pferreir/indico,indico/indico,indico/indico,OmeGak/indico,ThiefMaster/indico,indico/indico,mvidalgarcia/indico,ThiefMaster/indico,mic4ael/indico,mic4ael/indico,pferreir/indico,pferreir/indico,mvidalgarcia/indico,mic4ael/indico,DirkHoffmann/indico,ThiefMaster/indico,indico/indico,DirkHoffmann/indico,OmeGak/indico,OmeGak/indico,DirkHoffmann/indico