diff --git a/admin/themes/default/css/default.css b/admin/themes/default/css/default.css
index ffefc7f..10b86ef 100644
--- a/admin/themes/default/css/default.css
+++ b/admin/themes/default/css/default.css
@@ -444,19 +444,19 @@ td, th {
     margin-bottom: 10px;
 }
 
-.margin-top-1em {
+.margin-top-1 {
     margin-top: 1em;
 }
 
-.margin-top-2em {
+.margin-top-2 {
     margin-top: 2em;
 }
 
-.margin-bottom-1em {
+.margin-bottom-1 {
     margin-bottom: 1em;
 }
 
-.margin-bottom-2em {
+.margin-bottom-2 {
     margin-bottom: 2em;
 }