diff --git a/index.html b/index.html
index 7fa4a46..44a072a 100644
--- a/index.html
+++ b/index.html
@@ -4,8 +4,10 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Document</title>
+    <link rel="stylesheet" href="main.css">
 </head>
 <body>
     Code dòng thứ 1
+    Code dòng thứ 2
 </body>
 </html>
\ No newline at end of file
diff --git a/main.css b/main.css
new file mode 100644
index 0000000..e69de29
