diff --git a/client/index.html b/client/index.html
index d363e8a..e08e50a 100644
--- a/client/index.html
+++ b/client/index.html
@@ -1,8 +1,11 @@
-<html>
+<html lang="en">
 <head>
-    <title>CSS layout</title>
     <meta charset="utf-8" />
+    <title>CSS layout</title>
     <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="description" content="CSS layouts and patterns" />
+    <meta name="keywords" content="css display, css flexbox, css grid, css layouts, flex, flexbox, flexbox cheatsheet, web design, web template" />
+    <meta name="author" content="Nguyen Huu Phuoc" />
     <link href="https://fonts.googleapis.com/css?family=Source+Code+Pro&display=swap" rel="stylesheet">
 </head>
 <body style="width: 100%;">
