CHANGE use scrolllistener only when site is 1.5 times the screen size

static/js/scroll.js

@@ -1,3 +1,5 @@
+window.onload = (event) => {
+  if ((document.documentElement.scrollHeight / window.screen.availHeight ) > 1.5) {
     window.addEventListener("scroll", () => {
       var winScroll = document.body.scrollTop || document.documentElement.scrollTop;
       var height = document.documentElement.scrollHeight - document.documentElement.clientHeight;
@@ -10,3 +12,5 @@ window.addEventListener("scroll", () => {
         toTop.classList.toggle("show");
       }
     });
+  }
+}