diff --git a/frontend/src/index.css b/frontend/src/index.css
index bd1671e..5b7eed6 100644
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
@@ -29,6 +29,13 @@
   -webkit-tap-highlight-color: transparent;
 }
 
+/* Room for the scrollbar is always kept: pages that scroll (e.g. a wide Kanban board) and pages that do
+   not keep the same width, so nothing shifts when switching tabs. Overlay scrollbars (phones) are not
+   affected. */
+html {
+  scrollbar-gutter: stable;
+}
+
 body {
   background-color: var(--bg-app);
   color: var(--text-main);