diff --git a/Bootstrap.Client/wwwroot/css/theme-responsive.css b/Bootstrap.Client/wwwroot/css/theme-responsive.css
index 2bff06db..2f869944 100644
--- a/Bootstrap.Client/wwwroot/css/theme-responsive.css
+++ b/Bootstrap.Client/wwwroot/css/theme-responsive.css
@@ -42,3 +42,9 @@
         max-width: 900px;
     }
 }
+
+@media (min-width: 1200px) {
+    .modal-lg {
+        max-width: calc(100% - 200px);
+    }
+}