Fix drag bug

Author: cpreid2

index.html

@@ -209,6 +209,11 @@
   background-color: #fff;
   display: block;
   margin-bottom: 16px;
+  -webkit-user-select: none;
+  -moz-user-select: none;
+  user-select: none;
+  -webkit-user-drag: none;
+  -khtml-user-drag: none;
 }
 
 /* ───────── 6. Bottom Slider Panel ─ */