code: @Override
      public String getCssText() {
          final StringBuilder sb = new StringBuilder("@media ");
  
          sb.append(getMediaList().getMediaText());
          sb.append(" {");
          for (int i = 0; i < getCssRules().getLength(); i++) {
              final AbstractCSSRuleImpl rule = getCssRules().getRules().get(i);
              sb.append(rule.getCssText()).append(" ");
          }
          sb.append("}");
          return sb.toString();
      }
docs: {@inheritDoc}