bootstrapa 4 add button code example

Example 1: how to add a button bootstrap

<button class="btn btn-primary">Primary</button>
<a href="#" class="btn btn-secondary">Secondary</button>

Example 2: Bootstrap 4 Button Groups

<div class="btn-group">
  <button type="button" class="btn btn-primary">Apple</button>
  <button type="button" class="btn btn-primary">Samsung</button>
  <button type="button" class="btn btn-primary">Sony</button>
</div>