Bootstrap class: .btn-lg

<button type="button" class="btn btn-primary btn-lg">Large button</button>

Preview

Sass source

/* _button-group.scss:95 */
.btn-lg + .dropdown-toggle-split {
  padding-right: $btn-padding-x-lg * .75;
  padding-left: $btn-padding-x-lg * .75;
}

/* _buttons.scss:113 */
.btn-lg {
  @include button-size($btn-padding-y-lg, $btn-padding-x-lg, $font-size-lg, $btn-line-height-lg, $btn-border-radius-lg);
}

Uses variables

/* _button-group.scss:95 */
$btn-padding-x-lg
$btn-padding-x-lg

/* _buttons.scss:113 */
$btn-padding-y-lg
$btn-padding-x-lg
$font-size-lg
$btn-line-height-lg
$btn-border-radius-lg