diff --git a/core/modules/system/system.admin.css b/core/modules/system/system.admin.css
index a7f2cbd..f25b0da 100644
--- a/core/modules/system/system.admin.css
+++ b/core/modules/system/system.admin.css
@@ -223,8 +223,10 @@ table.screenshot {
   margin-bottom: 20px;
 }
 .system-themes-list-disabled {
-  border-top: 1px solid #cdcdcd;
-  padding-top: 20px;
+  background: #F8F8F8;
+  border: 1px solid #cdcdcd;
+  border-width: 1px 0;
+  padding: 20px 0;
 }
 .system-themes-list h2 {
   margin: 0;
@@ -245,16 +247,15 @@ table.screenshot {
 .theme-default .screenshot {
   border: 1px solid #aaa;
 }
-.system-themes-list-enabled .theme-selector .screenshot,
-.system-themes-list-enabled .theme-selector .no-screenshot {
+.system-themes-list .theme-selector .screenshot,
+.system-themes-list .theme-selector .no-screenshot {
   float: left; /* LTR */
   margin: 0 20px 0 0; /* LTR */
 }
 .system-themes-list-disabled .theme-selector .screenshot,
 .system-themes-list-disabled .theme-selector .no-screenshot {
-  width: 194px;
-  height: 144px;
-  line-height: 144px;
+  float: none;
+  margin-bottom: 10px;
 }
 .theme-selector h3 {
   font-weight: normal;
@@ -262,20 +263,12 @@ table.screenshot {
 .theme-default h3 {
   font-weight: bold;
 }
-.system-themes-list-enabled .theme-selector h3 {
+.system-themes-list .theme-selector h3 {
   margin-top: 0;
 }
-.system-themes-list-disabled .theme-selector {
-  width: 300px;
-  float: left; /* LTR */
-  padding: 20px 20px 20px 0; /* LTR */
-}
-.system-themes-list-enabled .theme-info {
+.system-themes-list .theme-info {
   max-width: 940px;
 }
-.system-themes-list-disabled .theme-info {
-  min-height: 170px;
-}
 .theme-selector .incompatible {
   margin-top: 10px;
   font-weight: bold;
@@ -301,6 +294,13 @@ table.screenshot {
 #system-themes-admin-form {
   clear: left;
 }
+@media screen and (max-width: 570px) {
+  .system-themes-list .theme-selector .screenshot,
+  .system-themes-list .theme-selector .no-screenshot {
+    float: none;
+    margin-bottom: 10px;
+  }
+}
 
 /**
  * Exposed filters.