diff --git a/lib/Form/Util/Styles.php b/lib/Form/Util/Styles.php
index 52ac5d6996..a2881bc2d0 100644
--- a/lib/Form/Util/Styles.php
+++ b/lib/Form/Util/Styles.php
@@ -165,6 +165,7 @@ EOL;
         top: auto;
         transform: none;
         width: 100%;
+        min-width: 100%;
       }} ";
     }