fix: markup for box-shadow

browser/main/TopBar/TopBar.styl

@@ -2,7 +2,6 @@
   position relative
   background-color $ui-noteList-backgroundColor
   height $topBar-height - 1
-  z-index $topbar-z-index
 
 .root--expanded
   @extend .root
@@ -61,6 +60,7 @@ $control-height = 34px
   overflow ellipsis
   &:hover
     background-color alpha($ui-active-color, 10%)
+
 .control-search-optionList-item-folder
   border-left 4px solid transparent
   padding 2px 5px
@@ -69,14 +69,17 @@ $control-height = 34px
   font-size 12px
   height 16px
   margin-bottom 4px
+
 .control-search-optionList-item-folder-surfix
   font-size 10px
   margin-left 5px
   color $ui-inactive-text-color
+
 .control-search-optionList-item-type
   font-size 12px
   color $ui-inactive-text-color
   padding-right 3px
+
 .control-search-optionList-empty
   height 150px
   color $ui-inactive-text-color