Add default option and XS size to size selection dropdown in index.html

Author: moses77-boop

Form-Controls/index.html

@@ -48,7 +48,8 @@ <h1>Product Pick</h1>
           <div class="for-row">
             <label for="size">Size</label>
             <select id="size" name="size" required>
-              
+              <option value="" disabled selected>Select a size</option>
+              <option value="XS">XS</option>
             </select>
           </div>
         </fieldset>