diff --git a/app/assets/stylesheets/zammad.scss b/app/assets/stylesheets/zammad.scss
index fe1be3336..1d22274cf 100644
--- a/app/assets/stylesheets/zammad.scss
+++ b/app/assets/stylesheets/zammad.scss
@@ -11527,6 +11527,7 @@ span.is-disabled {
   }
 
   &-main {
+    width: 100%;
     @include ltr(transition, margin-right 500ms);
     @include ltr(margin-right, 280px);
     @include rtl(transition, margin-left 500ms);