diff --git a/swh/web/assets/src/bundles/webapp/webapp-utils.js b/swh/web/assets/src/bundles/webapp/webapp-utils.js
--- a/swh/web/assets/src/bundles/webapp/webapp-utils.js
+++ b/swh/web/assets/src/bundles/webapp/webapp-utils.js
@@ -124,6 +124,18 @@
       selectCode(e, selectedCode);
     }
   });
+
+  // show/hide back-to-top button
+  let scrollThreshold = 0;
+  scrollThreshold += $('.swh-top-bar').height() || 0;
+  scrollThreshold += $('.navbar').height() || 0;
+  $(window).scroll(() => {
+    if ($(window).scrollTop() > scrollThreshold) {
+      $('#back-to-top').css('display', 'block');
+    } else {
+      $('#back-to-top').css('display', 'none');
+    }
+  });
 });
 
 export function initPage(page) {
diff --git a/swh/web/assets/src/bundles/webapp/webapp.css b/swh/web/assets/src/bundles/webapp/webapp.css
--- a/swh/web/assets/src/bundles/webapp/webapp.css
+++ b/swh/web/assets/src/bundles/webapp/webapp.css
@@ -235,7 +235,7 @@
 }
 
 #back-to-top {
-    display: initial;
+    display: none;
     position: fixed;
     bottom: 30px;
     right: 30px;