Rearrange registration page

assets/css/app.css

@@ -4,6 +4,7 @@
 @import './header.css';
 @import './form_modal.css';
 @import './live/form.css';
+@import './live/registration.css';
 @import './pages/privacy.css';
 
 /* Alerts and form errors used by phx.new */

assets/css/live/registration.css

@@ -0,0 +1,3 @@
+.registeration-button {
+  margin-bottom: 3rem;
+}