diff --git a/html/index.html b/html/index.html
index bff2410..cde852d 100644
--- a/html/index.html
+++ b/html/index.html
@@ -33,10 +33,15 @@
 				content: "•";
 				color: #ccc;
 			}
+			.menudiv {
+				margin-bottom: 0.5em;
+				padding-bottom: 0.5em;
+				border-bottom: 1px solid #ccc;
+			}
 		</style>
 	</head>
 	<body>
-		<div>
+		<div class="menudiv">
 			<input type="file" id="bltFile">
 			<button onclick="clickCount()">Count</button>
 			<i class="sep"></i>
@@ -58,7 +63,7 @@
 			<a href="https://yingtongli.me/blog/2020/12/24/pyrcv2.html">Information and instructions</a>
 		</div>
 		
-		<div id="divAdvancedOptions" style="display: none;">
+		<div id="divAdvancedOptions" class="menudiv" style="display: none;">
 			<label>
 				Numbers:
 				<select id="selNumbers">
