center line for 0 cents difference

index.html

@@ -15,6 +15,15 @@
 		input[type="range"] {
 			-webkit-appearance: none;
 			border: 1px solid black;
+			width:200px;
+			margin:0;
+			box-sizing:border-box;
+		}
+		div {
+			width: 100px;
+			border-right:1px solid black;
+			height:10px;
+			box-sizing:border-box;
 		}
 	</style>
 </head>
@@ -36,6 +45,7 @@
 	</section>
 	<section id="analyze-pitch">
 		<h2>Pitch Analyzer</h2>
+		<div></div>
 		<input type="range" min="-100" max="100" value="0"/>
 	</section>
 </body>