fixes #8687: correct docs typo on radio inputs

css.html

@@ -1392,6 +1392,8 @@ For example, <code>&lt;section&gt;</code> should be wrapped as inline.
     <input type="radio" name="optionsRadios" id="optionsRadios1" value="option1" checked>
     Option one is this and that&mdash;be sure to include why it's great
   </label>
+</div>
+<div class="radio">
   <label>
     <input type="radio" name="optionsRadios" id="optionsRadios2" value="option2">
     Option two can be something else and selecting it will deselect option one