diff --git a/example/index.html b/example/index.html
index d3bc987..62f5e99 100644
--- a/example/index.html
+++ b/example/index.html
@@ -47,7 +47,7 @@
                 </div>
                 <div class="form-row">
                     <div class="form-group col-md-6">
-                        <label for="birthday">Gender</label>
+                        <label for="gender">Gender</label>
                         <select class="custom-select" name="gender" id="gender" required>
                             <option selected value="M">Male</option>
                             <option value="F">Female</option>
@@ -60,12 +60,12 @@
                 </div>
                 <div class="form-row">
                     <div class="form-group col-md-6">
-                        <label for="birthday">Birthplace province</label>
+                        <label for="birthday_province">Birthplace province</label>
                         <select class="custom-select" name="birthplace_province" id="birthplace_province" required>
                         </select>
                     </div>
                     <div class="form-group col-md-6">
-                        <label for="birthday">Birthplace</label>
+                        <label for="birthplace">Birthplace</label>
                         <select class="custom-select" name="birthplace" id="birthplace" required>
                         </select>
                     </div>