diff --git a/django/contrib/admin/static/admin/css/dashboard.css b/django/contrib/admin/static/admin/css/dashboard.css
index 1560c7b4a9..91d6efde80 100644
--- a/django/contrib/admin/static/admin/css/dashboard.css
+++ b/django/contrib/admin/static/admin/css/dashboard.css
@@ -23,5 +23,4 @@ ul.actionlist li {
     list-style-type: none;
     overflow: hidden;
     text-overflow: ellipsis;
-    -o-text-overflow: ellipsis;
 }
diff --git a/django/contrib/admin/static/admin/css/login.css b/django/contrib/admin/static/admin/css/login.css
index 2ec241c27a..d88249bf28 100644
--- a/django/contrib/admin/static/admin/css/login.css
+++ b/django/contrib/admin/static/admin/css/login.css
@@ -55,9 +55,7 @@ body.login {
     clear: both;
     padding: 8px;
     width: 100%;
-    -webkit-box-sizing: border-box;
-       -moz-box-sizing: border-box;
-            box-sizing: border-box;
+    box-sizing: border-box;
 }
 
 .login span.help {
diff --git a/django/contrib/admin/static/admin/css/responsive.css b/django/contrib/admin/static/admin/css/responsive.css
index 238d68be84..e1ce9c27d1 100644
--- a/django/contrib/admin/static/admin/css/responsive.css
+++ b/django/contrib/admin/static/admin/css/responsive.css
@@ -99,9 +99,7 @@ input[type="submit"], button {
     }
 
     #changelist-search > div {
-        display: -webkit-flex;
         display: flex;
-        -webkit-flex-wrap: wrap;
         flex-wrap: wrap;
         max-width: 480px;
     }
@@ -111,7 +109,6 @@ input[type="submit"], button {
     }
 
     #changelist #toolbar form #searchbar {
-        -webkit-flex: 1 0 auto;
         flex: 1 0 auto;
         width: 0;
         height: 22px;