not sure of change, perhaps just blankspaces, but wanted to save before starting

index.html

@@ -11,6 +11,7 @@
     
     <h3>Score:<span id="score">0</span></h3>
     <button id="start-button">Start/Pause</button>
+
     <div class="grid">
         <div></div>
         <div></div>
@@ -212,7 +213,6 @@
         <div></div>
         <div></div>
         <div></div>
-        <div></div>
     </div>
 </body>
 </html>

style.css

@@ -0,0 +1,13 @@
+.grid {
+    width: 200px;
+    height: 400px;
+    display: flex;
+    flex-wrap: wrap;
+    background-color: yellow;
+}
+
+.grid div {
+    height: 20px;
+    width: 20px;
+    background-color: red;
+}