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If the problem persists, check the browser console, or the terminal you've run Storybook from.
npm i mdbsvelte
yarn add mdbsvelte
<script href="https://unpkg.com/mdbsvelte@latest/dist/mdbsvelte.js"></script>
<!-- Font Awesome -->
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.2/css/all.css">
<!-- Google Fonts -->
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700&display=swap">
<!-- Bootstrap core CSS -->
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.4.1/css/bootstrap.min.css" rel="stylesheet">
<!-- Material Design Bootstrap -->
<link href="https://cdnjs.cloudflare.com/ajax/libs/mdbootstrap/4.16.0/css/mdb.min.css" rel="stylesheet">
<script>
import {MDBBtn} from 'mdbsvelte';
</script>
<MDBBtn>
Button
</MDBBtn>
<script>
import MDBBtn from 'mdbsvelte/src/MDBtn.svelte';
</script>
<MDBBtn>
Button
</MDBBtn>