Hi Malte,
Try adding the following code to Appereance Customizer Custom CSS:
.x-subscribe-form {
max-width: 700px !important;
}
.x-subscribe-form fieldset {
display: inline;
}
.x-subscribe-form input[type="submit"] {
margin-top: 0;
}
To assist you with this issue, we’ll first need you to provide us with your URL. This is to ensure that we can provide you with a tailored answer to your situation. Once you have provided us with your URL, we will be happy to assist you with everything.
Thanks
Joao