.btn
class
Bootstrap button styles. Combine .btn with .btn-{variant} and optionally .btn-sm or .btn-lg.
Syntax
<button class="btn btn-primary">Click</button>
Example
html
<button class="btn btn-primary">Primary</button>
<button class="btn btn-secondary">Secondary</button>
<button class="btn btn-success">Success</button>
<button class="btn btn-danger">Danger</button>
<button class="btn btn-outline-primary">Outline</button>
<button class="btn btn-primary btn-lg">Large</button>
<button class="btn btn-primary btn-sm">Small</button>
<button class="btn btn-primary w-100">Full width</button>