added dark mode

src/main/resources/templates/public/index.html

@@ -10,7 +10,7 @@
 	<ul layout:fragment="menu">
 	</ul>
 	<main layout:fragment="content">
-		<div class="card text-dark bg-light" style="width: 312px; margin: 24px">
+		<div class="card" style="width: 312px; margin: 24px">
 			<div class="card-header"><a class="btn btn-seondary btn-bordered btn-secondaryhover" style="width: 100%"
 					th:href="@{/done/list}">heutige Arbeitszeiten</a></div>
 			<div class="card-body">