Update selectsource.twig

mymodule/themes/fancytheme/multiauth/selectsource.twig

-  GNU nano 4.8                                              selectsource.twig                                                         
-{% set pagetitle = '{multiauth:multiauth:select_source_header}'|trans %}
-{% extends "base.twig" %}
+{% extends "@core/base.twig" %}
+{% block preload %}
+   <link rel="stylesheet" href="/css/styles.css">
+{% endblock %}
 
 {% block content %}
+    <div>
+    {% set pagetitle = '{multiauth:multiauth:select_source_header}'|trans %}
+
     <h2>Benutzerkonto auswählen</h2>
     <p>Bitte wählen Sie ein Benutzerkonto aus, mit dem Sie sich authentifizieren wollen:</p>
 
     <form action="{{ selfUrl|escape('html') }}" method="get">
         <input type="hidden" name="AuthState" value="{{ authstate|escape('html') }} ">
-        <ul>
         {% for key, source in sources %}
             {% set name = ('src-' ~ source.source64) %}
             {% set button = ('button-' ~ source.source) %}
-	    <li class="{{ source.css_class|escape('html') }} authsource">
             <input class="button-red button-margin btn btn-primary" type="submit" name="{{ name|escape('html') }}" id="{{ button|escape('html') }}" value="{{ source.text|escape('html') }}"{%- if source.source == preferred %} autofocus{% endif -%}>            
             {% if source.help %}
               <p>{{ source.help|escape('html') }}</p>
             {% endif %}
-            </li>
         {% endfor %}
-        </ul>
     </form>
+    </div>
 {% endblock %}