Make radio buttons required

Author: habohlin

Form-Controls/index.html

@@ -63,7 +63,7 @@ <h1>Product Pick</h1>
             <legend>T-shirt info</legend>
             <label for="color-radio-btns">Choose a colour:</label>
             <section id="color-radio-btns">
-              <input type="radio" name="color" id="white" value="white"/>
+              <input type="radio" name="color" id="white" value="white" required/>
               <label for="white">White</label>
               <input type="radio" name="color" id="black" value="black"/>
               <label for="white">Black</label>