Answers for "twitter bootstrap 3.3.7"

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

bootstrap cdn

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

JS
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>

JQuery
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>