adding or modifying the size for the grids

static/styles.css

@@ -32,8 +32,8 @@ h1, h2, h3 {
 }
 
 .cell {
-    width: 30px;
-    height: 30px;
+    width: 10px;
+    height: 10px;
     border: 1px solid #333;
 }