Add control-group new class

I am currently looking for a way to add a wide class to the classes control group.

Is there a possibility? Where can I insert it? I would like to determine the appearance of the individual fields, especially important is that I get the whole responsive.

Many thanks for the help!

Here is a short excerpt from the source code, I have marked the classes around which it goes.

<form id="osm_login_form" class="form form-horizontal" method="post" action="/mitgliedsantrag/register-login" name="osm_login_form" autocomplete="off">
<h2 class="osm-heading">
<div class="control-group">
<div class="control-group">

If you want to modify the code of that section, please look at the file components\com_osmembership\register\tmpl\default_login.php and change it to meet your need

Regards,

Tuan

I finally found time today to implement their tip. But I have only the following folders
- controller
- helper
Module
- plugin
- tcpdf
- views

The folder register I have not. Where could the error lie?

components\com_osmembership\VIEW\register\tmpl\default_login.php

There was a folder missing in the path

Yes. The correct path is components\com_osmembership\view\register\tmpl\default_login.php as you figured out. Sorry for missing view from the path

Tuan