diff -u b/core/modules/system/css/system.theme.css b/core/modules/system/css/system.theme.css
--- b/core/modules/system/css/system.theme.css
+++ b/core/modules/system/css/system.theme.css
@@ -566,6 +566,7 @@
   border-color: #c9e1bd transparent #c9e1bd #c9e1bd;
   box-shadow: 8px 0 0 #77b259;
   margin-right: 8px;
+  margin-left: 0;
 }
 .messages--status,
 .ok {
only in patch2:
unchanged:
--- a/core/themes/bartik/css/style.css
+++ b/core/themes/bartik/css/style.css
@@ -1288,7 +1288,10 @@ div.tabs {
   background: rgba(30, 50, 10, 0.08);
 }
 div.messages {
-  margin: 8px 15px;
+  margin: 8px 15px 8px 23px;
+}
+[dir="rtl"] div.messages {
+  margin: 8px 23px 8px 15px;
 }
 
 /* -------------- Breadcrumbs   -------------- */