diff --git a/core/modules/simpletest/css/simpletest.module.css b/core/modules/simpletest/css/simpletest.module.css
index c0079b6..1029dc8 100644
--- a/core/modules/simpletest/css/simpletest.module.css
+++ b/core/modules/simpletest/css/simpletest.module.css
@@ -1,9 +1,9 @@
 
 /* Test Table */
-#simpletest-form-table th.select-all {
+.simpletest-test-form .select-all {
   width: 1em;
 }
-th.simpletest-test-label {
+.simpletest-test-label {
   width: 40%;
 }
 
@@ -12,34 +12,25 @@ th.simpletest-test-label {
   cursor: pointer;
   width: 1em;
 }
-.simpletest-group-label label {
-  display: inline;
-  font-weight: bold;
-}
 .simpletest-test-label label {
-  margin-left: 1em; /* LTR */
+  margin: 0 0 0 1em; /* LTR */
+}
+[dir="rtl"] .simpletest-test-label label {
+  margin: 0 1em 0 0; /* RTL */
 }
 .simpletest-test-description .description {
   margin: 0;
 }
-#simpletest-form-table tr td {
-  background-color: white;
-  color: #494949;
-}
-#simpletest-form-table tr.simpletest-group td {
+#simpletest-form-table .simpletest-group td {
   background-color: #edf5fa;
   color: #494949;
 }
 
-table#simpletest-form-table tr.simpletest-group label {
+.simpletest-test-form .simpletest-group label {
   display: inline;
 }
 
-div.message > div.item-list {
-  font-weight: normal;
-}
-
-div.simpletest-pass {
+.simpletest-pass {
   color: #33a333;
 }
 .simpletest-fail {
@@ -47,47 +38,47 @@ div.simpletest-pass {
 }
 
 tr.simpletest-pass,
-tr.simpletest-pass.odd {
+.simpletest-pass:nth-child(odd).odd {
   background-color: #b6ffb6;
 }
-tr.simpletest-pass.even {
+.simpletest-pass:nth-child(even).even {
   background-color: #9bff9b;
 }
 tr.simpletest-fail,
-tr.simpletest-fail.odd {
+.simpletest-fail:nth-child(odd).odd {
   background-color: #ffc9c9;
 }
-tr.simpletest-fail.even {
+.simpletest-fail:nth-child(even).even {
   background-color: #ffacac;
 }
 tr.simpletest-exception,
-tr.simpletest-exception.odd {
+.simpletest-exception:nth-child(odd).odd {
   background-color: #f4ea71;
 }
-tr.simpletest-exception.even {
+.simpletest-exception:nth-child(even).even {
   background-color: #f5e742;
 }
 tr.simpletest-debug,
-tr.simpletest-debug.odd {
+.simpletest-debug:nth-child(odd).odd {
   background-color: #eee;
 }
-tr.simpletest-debug.even {
+.simpletest-debug:nth-child(even).even {
   background-color: #fff;
 }
 
-a.simpletest-collapse {
+.simpletest-collapse {
   height: 0;
   width: 0;
   top: -99em;
   position: absolute;
 }
-a.simpletest-collapse:focus,
-a.simpletest-collapse:hover {
-  font-size: 80%;
-  top: 0px;
-  height: auto;
-  width: auto;
+.simpletest-collapse:focus,
+.simpletest-collapse:hover {
   overflow: visible;
   position: relative;
+  top: 0;
   z-index: 1000;
+  font-size: 80%;
+  height: auto;
+  width: auto;
 }
diff --git a/core/themes/seven/css/components/tables.css b/core/themes/seven/css/components/tables.css
index afc9301..f45af9b 100644
--- a/core/themes/seven/css/components/tables.css
+++ b/core/themes/seven/css/components/tables.css
@@ -48,6 +48,10 @@ tbody tr.color-error:hover,
 tbody tr.color-error:focus {
   background: #fcf4f2;
 }
+tbody tr.color-success:hover,
+tbody tr.color-success:focus {
+  background: #77b259;
+}
 td,
 th {
   vertical-align: middle;