code: def getSelectedTemplateCSS(self):
          
          template = self.getSelectedTemplate()
          # Look for the CSS
          content = ""
          if template.find(":") >= 0:
              # A template from another add-on
              prefix, template = template.split(":")
              templates_dir = self._getStickersTemplatesDirectory(prefix)
              css = "{0}.css".format(template[:-3])
              if css in os.listdir(templates_dir):
                  path = "%s/%s.css" % (templates_dir, template[:-3])
                  if os.path.isfile(path):
                      with open(path, "r") as content_file:
                          content = content_file.read()
          else:
              this_dir = os.path.dirname(os.path.abspath(__file__))
              templates_dir = os.path.join(this_dir, "templates/stickers/")
              # Only use the directory asked in "filter_by_type"
              if self.filter_by_type:
                  templates_dir = templates_dir + "/" + self.filter_by_type
              path = "%s/%s.css" % (templates_dir, template[:-3])
              if os.path.isfile(path):
                  with open(path, "r") as content_file:
                      content = content_file.read()
          return content
docs: Looks for the CSS file from the selected template and return its
             contents.
  
          If the selected template is default.pt, looks for a file named
          default.css in the stickers path and return its contents. If no CSS
          file found, retrns an empty string