Remove inline styling from buttons

I am using bootstrap, but setting confirmButtonClass: 'btn btn-primary', does not change any style.

This is because of some inline styling:

 style="display: inline-block; border-left-color: rgb(48, 133, 214); border-right-color: rgb(48, 133, 214); background-color: rgb(48, 133, 214);"

How can I disable this?

[limonte]

Thank you again @canfiax for the another great suggestion!

Done https://github.com/limonte/sweetalert2/releases/tag/v0.4.1

confirmButtonClass: 'btn btn-primary',
buttonsStyling: false,

[limonte]

@kennyhyun

How can I disable buttonsStyling

swal({
  text: 'Any fool can use a computer',
  buttonsStyling: false
})

Is there any global configurations?

swal.setDefauls({buttonsStyling: false});
swal('Any fool can use a computer')