bootstrap 4 btn btn-default code example

Example 1: bootstrap buttons Sizes

Fancy larger or smaller buttons? Add .btn-lg or .btn-sm for additional sizes.
<button type="button" class="btn btn-primary btn-lg">Large button</button>
<button type="button" class="btn btn-secondary btn-lg">Large button</button>

<button type="button" class="btn btn-primary btn-sm">Small button</button>
<button type="button" class="btn btn-secondary btn-sm">Small button</button>

<button type="button" class="btn btn-primary btn-lg btn-block">Block level button</button>
<button type="button" class="btn btn-secondary btn-lg btn-block">Block level button</button>

<a href="#" class="btn btn-primary btn-lg active" role="button" aria-pressed="true">Primary link</a>
<a href="#" class="btn btn-secondary btn-lg active" role="button" aria-pressed="true">Link</a>

Example 2: btn-default class in bootstrap 4

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

<div class="container m-3">
    <a class="btn btn-outline-secondary">outline-secondary link</a>
    <button type="button" class="btn btn-outline-secondary">outline-secondary 'button'</button>
    <br><br>
    <a class="btn btn-outline-light">outline-light link</a>
    <button type="button" class="btn btn-outline-light">outline-light 'button'</button>
</div>