diff --git a/core/themes/seven/css/components/system-status-report.css b/core/themes/seven/css/components/system-status-report.css
index 7869fbd710..fcdd2663db 100644
--- a/core/themes/seven/css/components/system-status-report.css
+++ b/core/themes/seven/css/components/system-status-report.css
@@ -34,9 +34,6 @@
   color: inherit;
   text-transform: none;
 }
-html:not(.details) .system-status-report__status-title {
-  padding-left: 0;
-}
 .system-status-report__status-title .details-title {
   padding-left: 3em; /* LTR */
 }
@@ -60,15 +57,6 @@ html:not(.details) .system-status-report__status-title {
   float: left;
 }
 
-/* Make poly-filled details and summary elements behave correctly. */
-.system-status-report summary:first-child ~ * {
-  display: none;
-}
-.system-status-report details[open] > *,
-.system-status-report details > summary:first-child {
-  display: block;
-}
-
 .system-status-report__status-title .details-title:before,
 .details .system-status-report__status-icon:before {
   content: "";