diff --git a/addons/web/static/src/css/base.css b/addons/web/static/src/css/base.css
index c261443b2b2..030c9828747 100644
--- a/addons/web/static/src/css/base.css
+++ b/addons/web/static/src/css/base.css
@@ -2036,6 +2036,7 @@ ul.oe-arrow-list {
 ul.oe-arrow-list li {
     display: inline-block;
     margin-left: -1em;
+    vertical-align: top;
 }
 ul.oe-arrow-list li span {
     vertical-align: top;
@@ -2044,11 +2045,11 @@ ul.oe-arrow-list li span {
     line-height:0em;
 }
 ul.oe-arrow-list .oe-arrow-list-before {
-    border-left-color: rgba(0,0,0,0);
+    border-left-color: transparent;
     border-right-width:0;
 }
 ul.oe-arrow-list .oe-arrow-list-after {
-    border-color: rgba(0,0,0,0);
+    border-color: transparent;
     border-left-color: #DEDEDE;
     border-right-width:0;
 }
@@ -2056,10 +2057,10 @@ ul.oe-arrow-list li.oe-arrow-list-selected span {
     border-color: #B5B9FF;
 }
 ul.oe-arrow-list li.oe-arrow-list-selected .oe-arrow-list-before {
-    border-left-color: rgba(0,0,0,0);
+    border-left-color: transparent;
 }
 ul.oe-arrow-list li.oe-arrow-list-selected .oe-arrow-list-after {
-    border-color: rgba(0,0,0,0);
+    border-color: transparent;
     border-left-color: #B5B9FF;
 }
 .openerp ul.oe-arrow-list li:first-child span:first-child{
diff --git a/addons/web/static/src/js/view_form.js b/addons/web/static/src/js/view_form.js
index e540ce10f95..e76a9a246b5 100644
--- a/addons/web/static/src/js/view_form.js
+++ b/addons/web/static/src/js/view_form.js
@@ -3346,9 +3346,9 @@ openerp.web.form.FieldStatus = openerp.web.form.Field.extend({
             if (this.check_white(color))
                 elem.css("color", "white");
             elem = this.$element.find("li.oe-arrow-list-selected .oe-arrow-list-before");
-            elem.css("border-left-color", "rgba(0,0,0,0)");
+            elem.css("border-left-color", "transparent");
             elem = this.$element.find("li.oe-arrow-list-selected .oe-arrow-list-after");
-            elem.css("border-color", "rgba(0,0,0,0)");
+            elem.css("border-color", "transparent");
             elem.css("border-left-color", color);
         }
     },