diff --git a/src/sao.less b/src/sao.less
index 473fe04d2b..4277a93309 100644
--- a/src/sao.less
+++ b/src/sao.less
@@ -161,6 +161,12 @@ img.icon {
     .editabletree-timedelta, .editabletree-boolean, .editabletree-many2one,
     .editabletree-one2many {
         width: 100%;
+
+        input[type='checkbox'] {
+            margin-top: 0;
+            margin-left: auto;
+            margin-right: auto;
+        }
     }
     & td {
         white-space: nowrap;