Index: django/contrib/admin/media/css/base.css
===================================================================
--- django/contrib/admin/media/css/base.css (revision 12454)
+++ django/contrib/admin/media/css/base.css (working copy)
@@ -637,14 +637,16 @@
 
 #content-main {
     float: left;
-    width: 100%;
+    min-width: 500px;
 }
 
 #content-related {
-    float: right;
-    width: 18em;
-    position: relative;
-    margin-right: -19em;
+    float: left;
+    position: absolute;
+    left: 525px;
+    min-width: 215px;
+    max-width: 500px;
+    overflow: auto;
 }