feat: improve scrollbars positions of timeline

templates/administrative/assignment/timeline.html.twig

@@ -3,7 +3,7 @@
 {% block title %}Einsatzübersicht{% endblock %}
 
 {% block content %}
-    <div class="overflow-scroll max-h-screen border border-gray-300 mb-16">
+    <div class="scroll-container border border-gray-300 mb-16">
         <table>
             <tr class="[&_th]:sticky [&_th]:top-0 [&_th]:z-10">
                 <th></th>