<button type="button" class="btn btn-primary">primary button</button>
<button type="button" class="btn btn-secondary">secondary button</button>
<button type="button" class="btn btn-success">Success</button>
<button type="button" class="btn btn-info">Info button</button>
<button type="button" class="btn btn-warning">warning button</button>
<button type="button" class="btn btn-danger">danger button</button>
<button type="button" class="btn btn-light">light button</button>
.btn-lg class for large size buttons
<button type="button" class="btn btn-primary btn-lg">primary button</button>
<button type="button" class="btn btn-secondary btn-lg">secondary button</button>
<button type="button" class="btn btn-success btn-lg">Success button</button>
<button type="button" class="btn btn-info btn-lg">Info button</button>
<button type="button" class="btn btn-warning btn-lg">warning button</button>
<button type="button" class="btn btn-danger btn-lg">danger button</button>
<button type="button" class="btn btn-light btn-lg">light button</button>
.btn-sm class for small size buttons
<button type="button" class="btn btn-primary btn-sm">primary button</button>
<button type="button" class="btn btn-secondary btn-sm">secondary button</button>
<button type="button" class="btn btn-success btn-sm">Success button</button>
<button type="button" class="btn btn-info btn-sm">Info button</button>
<button type="button" class="btn btn-warning btn-sm">warning button</button>
<button type="button" class="btn btn-danger btn-sm">danger button</button>
<button type="button" class="btn btn-danger btn-sm">danger button</button>
.btn-xs class for extra small size buttons
<button type="button" class="btn btn-primary btn-xs">primary button</button>
<button type="button" class="btn btn-secondary btn-xs">secondary button</button>
<button type="button" class="btn btn-success btn-xs">Success button</button>
<button type="button" class="btn btn-info btn-xs">Info button</button>
<button type="button" class="btn btn-warning btn-xs">warning button</button>
<button type="button" class="btn btn-danger btn-xs">danger button</button>
.active class for active state
<button type="button" class="btn btn-primary active">active</button>
<button type="button" class="btn btn-secondary active">active</button>
<button type="button" class="btn btn-success active">active</button>
<button type="button" class="btn btn-info active">active</button>
<button type="button" class="btn btn-warning active">active</button>
<button type="button" class="btn btn-danger active">active</button>
.disabled class or disabled="disabled" attribute for disabled button
<button type="button" class="btn btn-primary disabled">disabled</button>
<button type="button" class="btn btn-secondary disabled">disabled</button>
<button type="button" class="btn btn-success disabled">disabled</button>
<button type="button" class="btn btn-info disabled">disabled</button>
<button type="button" class="btn btn-warning disabled">disabled</button>
<button type="button" class="btn btn-danger disabled">disabled</button>
.btn class used with <button>, <a> and <input> elements.
<a class="btn btn-primary" href="#" data-toggle="tooltip;" title="btn btn-primary" role="button">link</button>
<input class="btn btn-primary" type="button" value="Input" data-toggle="tooltip;" title="btn btn-secondary">
<input class="btn btn-success" type="submit" value="Submit" data-toggle="tooltip" title="btn btn-success">
<button class="btn btn-info" type="submit">Button</button>
.btn-outline-* class for border button
<button type="button" class="btn btn-outline-primary">Primary Button</button>
<button type="button" class="btn btn-outline-secondary">Secondary Button</button>
<button type="button" class="btn btn-outline-success">Success Button</button>
<button type="button" class="btn btn-outline-info">Info Button</button>
<button type="button" class="btn btn-outline-warning">Warning Button</button>
<button type="button" class="btn btn-outline-danger">Danger Button</button>
<button type="button" class="btn btn-outline-light txt-dark">Light Button</button>
.btn-outline-*-2x class for bold outline
<button type="button" class="btn btn-outline-primary">Primary Button</button>
<button type="button" class="btn btn-outline-secondary">Secondary Button</button>
<button type="button" class="btn btn-outline-success">Success Button</button>
<button type="button" class="btn btn-outline-info">Info Button</button>
<button type="button" class="btn btn-outline-warning">Warning Button</button>
<button type="button" class="btn btn-outline-danger">Danger Button</button>
<button type="button" class="btn btn-outline-light txt-dark">Light Button</button>
.btn-outline-* class for outline and .btn-lg class for large button
<button type="button" class="btn btn-outline-primary btn-lg">Primary Button</button>
<button type="button" class="btn btn-outline-secondary btn-lg">Secondary Button</button>
<button type="button" class="btn btn-outline-success btn-lg">Success Button</button>
<button type="button" class="btn btn-outline-info btn-lg">Info Button</button>
<button type="button" class="btn btn-outline-warning btn-lg">Warning Button</button>
<button type="button" class="btn btn-outline-danger btn-lg">Danger Button</button>
<button type="button" class="btn btn-outline-light btn-lg txt-dark">Light Button</button>
.btn-outline-* class for outline and .btn-sm class for small button
<button type="button" class="btn btn-outline-primary btn-sm">Primary Button</button>
<button type="button" class="btn btn-outline-secondary btn-sm">Secondary Button</button>
<button type="button" class="btn btn-outline-success btn-sm">Success Button</button>
<button type="button" class="btn btn-outline-info btn-sm">Info Button</button>
<button type="button" class="btn btn-outline-warning btn-sm">Warning Button</button>
<button type="button" class="btn btn-outline-danger btn-sm">Danger Button</button>
<button type="button" class="btn btn-outline-light btn-sm txt-dark">Light Button</button>
.btn-outline-* class for outline and .btn-xs class for extra small button
<button type="button" class="btn btn-outline-primary btn-xs">Primary Button</button>
<button type="button" class="btn btn-outline-secondary btn-xs">Secondary Button</button>
<button type="button" class="btn btn-outline-success btn-xs">Success Button</button>
<button type="button" class="btn btn-outline-info btn-xs">Info Button</button>
<button type="button" class="btn btn-outline-warning btn-xs">Warning Button</button>
<button type="button" class="btn btn-outline-danger btn-xs">Danger Button</button>
<button type="button" class="btn btn-outline-light btn-xs txt-dark">Light Button</button>
.disabled class or disabled="disabled" attribute for disabled state
<button type="button" class="btn btn-outline-primary disabled">disabled</button>
<button type="button" class="btn btn-outline-secondary disabled">disabled</button>
<button type="button" class="btn btn-outline-success disabled">disabled</button>
<button type="button" class="btn btn-outline-info disabled">disabled</button>
<button type="button" class="btn btn-outline-warning disabled">disabled</button>
<button type="button" class="btn btn-outline-danger disabled">disabled</button>
<button type="button" class="btn btn-outline-light disabled txt-dark">disabled</button>
.btn-*-gradien class for gradien button
<button type="button" class="btn btn-primary-gradien"> Primary Button</button>
<button type="button" class="btn btn-secondary-gradien"> Secondary Button</button>
<button type="button" class="btn btn-success-gradien"> Success Button</button>
<button type="button" class="btn btn-info-gradien"> Info Button</button>
<button type="button" class="btn btn-warning-gradien"> Warning Button</button>
<button type="button" class="btn btn-danger-gradien"> Danger Button</button>