diff --git a/core/modules/system/css/system.admin.css b/core/modules/system/css/system.admin.css
index 74b473387e70a45f2bf785c8a68a3b1a1d97017a..f62af51e78c3d273b9453bfe4a3b1ee83a8dfecb 100644
--- a/core/modules/system/css/system.admin.css
+++ b/core/modules/system/css/system.admin.css
@@ -47,16 +47,16 @@ small .admin-link:after {
 /**
  * Modules page.
  */
-#system-modules table {
-  table-layout: fixed;
+#system-modules thead > tr {
+  border: 0;
 }
 #system-modules div.incompatible {
   font-weight: bold;
 }
-#system-modules th.checkbox {
+#system-modules td.checkbox {
   width: 4%;
 }
-#system-modules th.name {
+#system-modules td.module {
   width: 25%;
 }
 #system-modules td {
@@ -105,10 +105,10 @@ small .admin-link:after {
 }
 
 @media screen and (max-width: 40em) {
-  #system-modules th.name {
+  #system-modules td.name {
     width: 20%;
   }
-  #system-modules th.description {
+  #system-modules td.description {
     width: 40%;
   }
 }
diff --git a/core/modules/system/src/Form/ModulesListForm.php b/core/modules/system/src/Form/ModulesListForm.php
index b58cab83efe0b0ab98e2a13b0c968fce7c65f873..f825071da6a125c82318601dc522fbd7ae44f48c 100644
--- a/core/modules/system/src/Form/ModulesListForm.php
+++ b/core/modules/system/src/Form/ModulesListForm.php
@@ -175,9 +175,9 @@ public function buildForm(array $form, array &$form_state) {
         '#open' => TRUE,
         '#theme' => 'system_modules_details',
         '#header' => array(
-          array('data' => '<span class="visually-hidden">' . $this->t('Installed') . '</span>', 'class' => array('checkbox')),
-          array('data' => $this->t('Name'), 'class' => array('name')),
-          array('data' => $this->t('Description'), 'class' => array('description', RESPONSIVE_PRIORITY_LOW)),
+          array('data' => $this->t('Installed'), 'class' => array('checkbox', 'visually-hidden')),
+          array('data' => $this->t('Name'), 'class' => array('name', 'visually-hidden')),
+          array('data' => $this->t('Description'), 'class' => array('description', 'visually-hidden', RESPONSIVE_PRIORITY_LOW)),
         ),
         '#attributes' => array('class' => array('package-listing')),
         // Ensure that the "Core" package comes first.