diff --git a/style.css b/style.css
index a937875..c36d2b6 100644
--- a/style.css
+++ b/style.css
@@ -1127,6 +1127,13 @@ table.dashboard td a:hover {
    On non-dashboard pages, wrap content in a glass panel. */
 #displaybox {
   padding: 20px 28px !important;
+  box-sizing: border-box !important;
+  max-width: calc(100vw - var(--sidebar-collapsed)) !important;
+  overflow-x: hidden !important;
+}
+
+html.sidebar-expanded.Theme--sidebar #displaybox {
+  max-width: calc(100vw - var(--sidebar-expanded)) !important;
 }
 
 /* Header bar — MUST stay transparent, no glass background */