[seahorse/wip/nielsdg/fix-css] css: Fix CSS unit

[Niels De Graef <nielsdg src gnome org>]

commit 57889c7fecd27b140a9bf244e3d7c6a2ea27ea6e
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Thu Feb 13 18:12:57 2020 +0100

    css: Fix CSS unit

 libseahorse/seahorse.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libseahorse/seahorse.css b/libseahorse/seahorse.css
index 1de94e86..a6e0563c 100644
--- a/libseahorse/seahorse.css
+++ b/libseahorse/seahorse.css
@@ -30,7 +30,7 @@
 }
 
 .seahorse-item-listbox-row {
-  margin: 12;
+  margin: 12px;
 }
 
 .seahorse-item-listbox-row > .seahorse-item-listbox-row-description {