Style 1
<div class="bd-example"><a href="#!" class="butn sm"><span>Button</span></a><a href="#!" class="butn md"><span>Button</span></a><a href="#!" class="butn"><span>Button</span></a></div><div class="bd-example"><a href="#!" class="butn secondary sm"><span>Button</span></a><a href="#!" class="butn secondary md"><span>Button</span></a><a href="#!" class="butn secondary"><span>Button</span></a></div>Style 2
<div class="bd-example"><button type="button" class="btn btn-primary">Primary</button><button type="button" class="btn btn-secondary">Secondary</button><button type="button" class="btn btn-success">Success</button><button type="button" class="btn btn-danger">Danger</button><button type="button" class="btn btn-warning">Warning</button><button type="button" class="btn btn-info">Info</button><button type="button" class="btn btn-light">Light</button><button type="button" class="btn btn-dark">Dark</button><button type="button" class="btn btn-link">Link</button></div>Style 3
<div class="bd-example"><button type="button" class="btn btn-outline-primary">Primary</button><button type="button" class="btn btn-outline-secondary">Secondary</button><button type="button" class="btn btn-outline-success">Success</button><button type="button" class="btn btn-outline-danger">Danger</button><button type="button" class="btn btn-outline-warning">Warning</button><button type="button" class="btn btn-outline-info">Info</button><button type="button" class="btn btn-outline-light">Light</button><button type="button" class="btn btn-outline-dark">Dark</button></div>