diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..2fdbccb
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "bootstrap"]
+	path = bootstrap
+	url = https://github.com/twbs/bootstrap.git
diff --git a/bootstrap b/bootstrap
new file mode 160000
index 0000000..5771fcc
--- /dev/null
+++ b/bootstrap
@@ -0,0 +1 @@
+Subproject commit 5771fcc4a9aed00057728988250269cfe0c9aa03
diff --git a/index.php b/index.php
index 40e5c67..099ce4b 100644
--- a/index.php
+++ b/index.php
@@ -6,7 +6,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
 
     <!-- Bootstrap CSS -->
-    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
+    <link rel="stylesheet" href="bootstrap/dist/css/bootstrap.min.css">
 
 	<link rel="shortcut icon" type="image/png" href="/favicon-32x32.png"/>
     <title>radner.ru</title>
@@ -158,7 +158,7 @@
     <!-- jQuery first, then Popper.js, then Bootstrap JS -->
     <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
-    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
+    <script src="bootstrap/dist/js/bootstrap.min.js"></script>
 
     <script type="text/javascript" src="main.js"></script>
   </body>