diff --git a/interface/web/themes/default/assets/stylesheets/ispconfig.css b/interface/web/themes/default/assets/stylesheets/ispconfig.css
index 534d2390f81541968bb372e21481179d5e9fe10e..c255573e6c5560d69bc99ef7ef6e7bc20ca3edbc 100644
--- a/interface/web/themes/default/assets/stylesheets/ispconfig.css
+++ b/interface/web/themes/default/assets/stylesheets/ispconfig.css
@@ -141,7 +141,9 @@ body {
 
 #sidebar {
   margin-top: 27px;
-  width: 18%;
+  min-width: 18%;
+  max-width: 21%;
+  width: auto;
   border-style: solid;
   border-width: 1px;
   border-radius: 4px; }