Default Buttons

.btn .btn-default
.btn .btn-primary
.btn .btn-success
.btn .btn-info
.btn .btn-warning
.btn .btn-danger
.btn .btn-link

Custom Buttons

btn btn-outline
.btn .btn-outline-light
.btn .btn-inverse
.btn .btn-inverse-light
.btn .btn-3d

Button size

Full width buttons