diff --git a/view/theme/vier/mobile.css b/view/theme/vier/mobile.css
index 0b7833ad4c..160c3c371d 100644
--- a/view/theme/vier/mobile.css
+++ b/view/theme/vier/mobile.css
@@ -300,4 +300,6 @@ select:focus {
 .event-start, .event-end { width: auto; }
 .event-start .dtstart, .event-end .dtend { float: none; display: block; }
 
-
+/** prv mail **/
+.mail-conv-detail { margin-left: 0px; width: 100%; }
+#prvmail-submit, #prvmail-text, #prvmail-subject { box-sizing: border-box; width: 100%; }