Fix line after Start button

Author: lulunac27a

index.html

@@ -12,8 +12,8 @@ <h1>Number Guessing Game with Score</h1>
     <p>Level: <span id="level"></span></p>
     <p>Feedback: <span id="feedback"></span></p>
     <!--button to start game--><button type="button" id="start-button">
-      Start
-    </button>
+      Start</button
+    ><br />
     <input type="number" id="guess" min="1" max="2" step="1" required />
     <!--button to check guess number--><button type="button" id="guess-button">
       Guess