Update index.html

added required field to the size selector

Author: bodoszidi

Form-Controls/index.html

@@ -80,7 +80,7 @@ <h1>Product Pick</h1>
                 </div>
                 <div class="size">
                     <label for="size">T-shirt Size</label>
-                    <select name="size" id="size">
+                    <select name="size" id="size" required>
                         <option value="XS">XS</option>
                         <option value="S">S</option>
                         <option value="M">M</option>