add hidden class to avoid initial layout shitft

src/index.html

@@ -23,7 +23,7 @@
                     <h1 class="tracking-normal leading-normal font-bold text-2xl md:text-3xl lg:text-4xl mb-1">Baumkataster</h1>
                     <h2><a href="/" class="text-xl md:text-2xl text-gray-700 hover:text-blue-700 focus:text-blue-800" title="Stadtplan Flensburg">Stadtplan Flensburg</a></h2>
                 </div>
-                <div class="bg-white border border-slate-300 leading-normal lg:mb-6 lg:text-lg mb-3 mx-3 p-3 rounded text-black text-md" id="details">
+                <div class="bg-white border border-slate-300 leading-normal lg:mb-6 lg:text-lg mb-3 mx-3 p-3 rounded text-black text-md hidden" id="details">
                     <ul id="detailList"></ul>
                 </div>
                 <form id="form" enctype="application/x-www-form-urlencoded">