implemented event log page for the device dashboard

examples/device-dashboard/web_root/index.html

@@ -9,7 +9,7 @@
     <link href="main.css" rel="stylesheet" />
     <link href="https://rsms.me/inter/inter.css" rel="stylesheet" />
   </head>
-  <body class="h-full"></body>
+  <body class="min-h-screen bg-slate-100"></body>
   <script src="history.min.js"></script>
   <script type="module" src="main.js"></script>
 </html>