Update index.html

index.html

@@ -59,6 +59,13 @@
 
             <div class="disk-track" id="diskTrack">
                 <div class="head" id="head"></div>
+                <div class="track-scale">
+                    <span>0</span>
+                    <span>50</span>
+                    <span>100</span>
+                    <span>150</span>
+                    <span>199</span>
+                </div>
             </div>
 
             <div id="stats">