diff --git a/assets/css/dark_theme.css b/assets/css/dark_theme.css
index d6ea53b8..a21f5f31 100644
--- a/assets/css/dark_theme.css
+++ b/assets/css/dark_theme.css
@@ -571,4 +571,11 @@ img[src$="groups_logo/default.png"] {
 */
 .page_account_created .message_container .message {
     background-color: var(--black5);
+}
+
+/**
+ * Call window
+ */
+.call-window {
+    border: 1px var(--black4) solid;
 }
\ No newline at end of file