diff --git a/apps/web/src/index.css b/apps/web/src/index.css
index cb805f1..43689cc 100644
--- a/apps/web/src/index.css
+++ b/apps/web/src/index.css
@@ -90,7 +90,7 @@
 
   .mail-content-grid {
     display: grid;
-    grid-template-columns: 528px minmax(0, 1fr);
+    grid-template-columns: 384px minmax(0, 1fr);
   }
 
   .mail-list-pane,
@@ -101,8 +101,8 @@
 
   .mail-list-pane {
     border-right: 1px solid hsl(var(--border));
-    width: 528px;
-    max-width: 528px;
+    width: 384px;
+    max-width: 384px;
   }
 
   @media (max-width: 767px) {