add extra input fields for container specific options

Signed-off-by: Arthur Lu <learthurgo@gmail.com>

index.html

@@ -6,6 +6,7 @@
 		<title>tronnet - client</title>
 		<link rel="icon" href="images/favicon.svg" sizes="any" type="image/svg+xml">
 		<link rel="stylesheet" href="css/style.css" type="text/css">
+		<link rel="stylesheet" href="css/form.css" type="text/css">
 		<script src="scripts/index.js" type="module"></script>
 		<script src="scripts/instance.js" type="module"></script>
 	</head>