modified index.html

changed border color

domain/tic-tac-toe/index.html

@@ -6,11 +6,11 @@
     }
 
     .board-cell {
-      border: 1px solid #666;
+      border: 2px solid #ccc;
       box-sizing: border-box;
       display: inline-block;
       font-size: 32px;
-      height: 100px;
+      height: 200px;
       line-height: 100px;
       text-align: center;
       width: 100px;