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if you are looking for a simple solution for a static website or basic stuff
all you need to do is to add this cdn to your html
<link rel="stylesheet" type="text/css" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
and this bootstrap javascript cdn for dropdowns and navbar
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
and the jQuery cdn
check this link for a live preview
https://stackblitz.com/edit/web-platform-ss4nvu?file=script.js
basicly this
<link rel="stylesheet" type="text/css"
href="https://stackpath.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://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
at the head tag ๐
but i see that you mentioned vue js in the tags you are looking for an answer so i also recommend on going throw the website of vueJS bootstrap which is amazing if you have any trouble i am available also in gmail ๐
dolev146@gmail.com
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You forgot to link css files from bootstrap.
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
copy paste it in the head of your html
also read the get started documentation: bootstrap get started doc
Source:stackexchange.com