diff --git a/core/modules/update/css/update.admin.theme.css b/core/modules/update/css/update.admin.theme.css
index e315794008..3b08bfe52c 100644
--- a/core/modules/update/css/update.admin.theme.css
+++ b/core/modules/update/css/update.admin.theme.css
@@ -80,20 +80,6 @@
   text-transform: none;
   font-weight: normal;
 }
-.project-update__compatibility-details .not-compatible,
-.project-update__compatibility-details .not-compatible summary,
-.project-update__compatibility-details .not-compatible summary:hover,
-.project-update__compatibility-details .not-compatible summary:focus,
-.project-update__compatibility-details details[open].not-compatible summary {
-  color: #a51b00;
-}
-.project-update__compatibility-details .compatible,
-.project-update__compatibility-details .compatible summary,
-.project-update__compatibility-details .compatible summary:hover,
-.project-update__compatibility-details .compatible summary:focus,
-.project-update__compatibility-details details[open].compatible summary {
-  color: #5c5c5b;
-}
 .project-update__compatibility-details .details-wrapper {
   margin: 0;
   padding: 5px 0;
diff --git a/core/themes/stable/css/update/update.admin.theme.css b/core/themes/stable/css/update/update.admin.theme.css
index e315794008..3b08bfe52c 100644
--- a/core/themes/stable/css/update/update.admin.theme.css
+++ b/core/themes/stable/css/update/update.admin.theme.css
@@ -80,20 +80,6 @@
   text-transform: none;
   font-weight: normal;
 }
-.project-update__compatibility-details .not-compatible,
-.project-update__compatibility-details .not-compatible summary,
-.project-update__compatibility-details .not-compatible summary:hover,
-.project-update__compatibility-details .not-compatible summary:focus,
-.project-update__compatibility-details details[open].not-compatible summary {
-  color: #a51b00;
-}
-.project-update__compatibility-details .compatible,
-.project-update__compatibility-details .compatible summary,
-.project-update__compatibility-details .compatible summary:hover,
-.project-update__compatibility-details .compatible summary:focus,
-.project-update__compatibility-details details[open].compatible summary {
-  color: #5c5c5b;
-}
 .project-update__compatibility-details .details-wrapper {
   margin: 0;
   padding: 5px 0;