How to set the className for the form in 1.0.0.Apha?

[a.o]

Previously I was doing this

<Form
            ref={form => {
              this.form = form;
            }}
            className="m-x-auto text-center app-login-form">

And when I updated to the alpha version it stopped working..

[Tim Brayshaw]

Good catch. Fix incoming.