fix: nav changes

less/topic.less

@@ -551,7 +551,7 @@
 					background-color: @gray-lighter;
 					.scroller-thumb {
 						width: 9px;
-						height: 20px;
+						height: 30px;
 						background-color: @brand-primary;
 						position: relative;
 						left: -3px;
@@ -560,6 +560,9 @@
 						.thumb-text {
 							font-weight: bolder;
 							margin-left: 20px;
+							user-select: none;
+							position: relative;
+							top: 5px;
 						}
 					}
 				}