diff --git a/static/aerbimJS.js b/static/aerbimJS.js
index b592a19..7346d75 100644
--- a/static/aerbimJS.js
+++ b/static/aerbimJS.js
@@ -464,22 +464,27 @@ function showContentPartTree (el) {
         $($arrow).animate({rotate: '0deg'})
     }
 }
-
+let waitingTop = null
 $(window).scroll(function (){
     if (window.location.href.includes("docs")){
         let $curtain = $(".left_curtain_documentation")
         let scroll = $(window)[0].scrollY
+        if (scroll === 0){
+            waitingTop = $(".left_curtain_documentation")[0].getBoundingClientRect().top - 172
+        }
         let $new_curtain = $($curtain[1])
-        if (!$curtain[1]){
+        if (!$curtain[1] && waitingTop){
             $new_curtain = $curtain.clone()
             $new_curtain.insertAfter($curtain)
         }
-        if (scroll >= 100){
-            $new_curtain.css({position:'fixed',top: 122})
+        if (scroll >= waitingTop && waitingTop){
+            $new_curtain.css({position:'fixed',top: 166})
             $($curtain[0]).css({opacity:0})
-        } else {
+        } else if (scroll < waitingTop && waitingTop) {
             $new_curtain.remove()
             $($curtain[0]).css({opacity:1})
+        } else if (!waitingTop){
+            waitingTop = $(".left_curtain_documentation")[0].getBoundingClientRect().top - 172
         }
     }
 })
\ No newline at end of file