Buttonsv5.x

---- Button sizes --------
<div class="mb-4"><button type="button" class="btn btn-primary btn-lg">Large button</button>
   <button type="button" class="btn btn-primary btn">Standard</button>
   <button type="button" class="btn btn-primary btn-sm">Small button</button>
</div>

---- Standard Button Variants --------
<div class="mb-4">
   <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>
---- Outline Buttons --------
<div class="mb-4">
   <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>
---- Alternate Button Variants --------
<div class="mb-4">
   <a class="btn btn-primary" href="#" role="button">Link</a>
   <button class="btn btn-primary" type="submit">Button</button>
   <input class="btn btn-primary" type="button" value="Input">
   <input class="btn btn-primary" type="submit" value="Submit">
   <input class="btn btn-primary" type="reset" value="Reset">
</div>
---- Full-width button --------
<div class="mb-4">
   <div class="d-grid gap-2">
      <button class="btn btn-primary" type="button">Button</button>
   </div>
</div>
---- Block level buttons --------
<div class="d-grid gap-2 col-6 mx-auto">
   <button class="btn btn-primary" type="button">Button</button>
</div>