diff --git a/django/contrib/admin/static/admin/css/base.css b/django/contrib/admin/static/admin/css/base.css
index 695d0c6a90..d5d3b58984 100644
--- a/django/contrib/admin/static/admin/css/base.css
+++ b/django/contrib/admin/static/admin/css/base.css
@@ -936,7 +936,8 @@ a.deletelink:focus, a.deletelink:hover {
 
 #branding h1 {
     padding: 0;
-    margin: 0 20px 0 0;
+    margin: 0;
+    margin-inline-end: 20px;
     font-weight: 300;
     font-size: 1.5rem;
     color: var(--header-branding-color);
diff --git a/django/contrib/admin/static/admin/css/dark_mode.css b/django/contrib/admin/static/admin/css/dark_mode.css
index b899a420d4..6d08233aae 100644
--- a/django/contrib/admin/static/admin/css/dark_mode.css
+++ b/django/contrib/admin/static/admin/css/dark_mode.css
@@ -72,7 +72,7 @@ html[data-theme="dark"] {
     padding: 0;
     background: transparent;
     vertical-align: middle;
-    margin-left: 5px;
+    margin-inline-start: 5px;
     margin-top: -1px;
 }