diff --git a/13_Day_Controlled_Versus_Uncontrolled_Input/13_uncontrolled_input.md b/13_Day_Controlled_Versus_Uncontrolled_Input/13_uncontrolled_input.md
index f27220d..2ac0fcc 100644
--- a/13_Day_Controlled_Versus_Uncontrolled_Input/13_uncontrolled_input.md
+++ b/13_Day_Controlled_Versus_Uncontrolled_Input/13_uncontrolled_input.md
@@ -146,7 +146,7 @@ class App extends Component {
             />
           </div>
 
-          <button class='btn btn-success'>Submit</button>
+          <button className='btn btn-success'>Submit</button>
         </form>
       </div>
     )
diff --git a/13_Day_Controlled_Versus_Uncontrolled_Input/13_uncontrolled_input_boilerplate/src/index.js b/13_Day_Controlled_Versus_Uncontrolled_Input/13_uncontrolled_input_boilerplate/src/index.js
index ef10f30..4954c52 100644
--- a/13_Day_Controlled_Versus_Uncontrolled_Input/13_uncontrolled_input_boilerplate/src/index.js
+++ b/13_Day_Controlled_Versus_Uncontrolled_Input/13_uncontrolled_input_boilerplate/src/index.js
@@ -68,7 +68,7 @@ class App extends Component {
             />
           </div>
 
-          <button class='btn btn-success'>Submit</button>
+          <button className='btn btn-success'>Submit</button>
         </form>
       </div>
     )