Answers for "view bootstrap style onlile"

enable ufw ubuntu

sudo ufw enable

ufw allow port

sudo ufw allow http
sudo ufw allow 80

allow ip through ufw

sudo ufw allow from 15.15.15.0/24  to any port 22

ufw linux

sudo ufw default deny incoming
sudo ufw default allow outgoing

bootstrap only cdn

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">

bootstrap

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>