Hi @franknet,
We are really sorry for the delayed response. You can use this custom CSS code to customize the submit button as per the requirements
.css code here for the form https://www.frank-network.de/registration/
.ur-frontend-form.ur-frontend-form--rounded form button.user-registration-multi-part-nav-next, .ur-frontend-form.ur-frontend-form--rounded form button.user-registration-multi-part-nav-prev, .ur-frontend-form.ur-frontend-form--rounded form button[type=submit], .ur-frontend-form.ur-frontend-form--rounded form input[type=submit] {
margin-left: 0;
background: #4994cd;
font-size: 16px;
padding: 15px 50px
}
And .CSS code for the form https://www.feuerwehr-stadt-remagen.de/register/
.ur-frontend-form.ur-frontend-form--rounded form button.user-registration-multi-part-nav-next, .ur-frontend-form.ur-frontend-form--rounded form button.user-registration-multi-part-nav-prev, .ur-frontend-form.ur-frontend-form--rounded form button[type=submit], .ur-frontend-form.ur-frontend-form--rounded form input[type=submit] {
margin-left: 0;
font-size: 16px;
padding: 15px 50px
}
And this form https://www.feuerwehr-stadt-remagen.de/newsletter-2/ is not working on our end.
Paste this code in the additional CSS box. You can find the additional CSS box in your theme customization option. Click on Appearance > Customize and then scroll a bit and you will see the Additional CSS box. Paste this code there and it will do the trick.
Let me know whether it helps or not and I will get back to you.
Thanks and Regards!