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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Document</title>
        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css">
        <script>
            document.addEventListener('DOMContentLoaded', () => {

            });
        </script>
    </head>
    <body>
        <button class="btn btn-success d-block"> Click me</button>
        <button class="btn btn-danger d-block"> Click me</button>
        <button class="btn btn-info d-block"> Click me</button>
        <button class="btn btn-warning d-block"> Click me</button>
        <button class="btn btn-dark d-block"> Click me</button>
        <button> Click me</button>
        <div class="alert alert-danger border-dark border border-5 rounded-4">lorem</div>
        <div class="alert alert-info border-dark border border-5 rounded-4">lorem</div>
    </body>
</html>