Why my display is different from bootstrap offical example?

I have a directory included

• css
• js
• index.html

When I copy bootstrap examples, the look and size is different.

This is my link and script, it seems link and script is different from bootstraps examples

<link rel="stylesheet" type="text/css" href="css/bootstrap.min.css">
<script type="js/bootstrap.min.js"></script>

This is boostrap example

    <!-- Bootstrap core CSS -->
<link href="/docs/5.1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">

example link

https://getbootstrap.com/docs/5.1/examples/sign-in/