Bug fixing: vertical border line of hiding-panel

Packages/viewerbase/client/components/basic/hidingPanel/hidingPanel.styl

@@ -33,15 +33,16 @@
   .hidingPanelContent
     width: 100%
     height: 100%
-    margin: 0 auto
+    margin: 1px auto
     float: none
     opacity: 0
     border: 1px solid #666
+    text-align: center
 
     .studyBrowserContainer
       position: absolute
       display: block
-      width: 100%
+      width: 120px
       left: 0
       right: 0
       top: 100px