The Demo
The Code
Output
Bootstrap 4 buttons with outline class
btn btn-outline-primary
btn btn-outline-secondary
btn btn-outline-success
btn btn-outline-info
btn btn-outline-light
btn btn-outline-dark
btn btn-outline-danger
btn btn-outline-warning
Bootstrap 4 buttons with outline class
btn btn-outline-primary
btn btn-outline-secondary
btn btn-outline-success
btn btn-outline-info
btn btn-outline-light
btn btn-outline-dark
btn btn-outline-danger
btn btn-outline-warning