diff --git a/core/modules/outside_in/tests/modules/outside_in_test_css/css/css_fix.theme.css b/core/modules/outside_in/tests/modules/outside_in_test_css/css/css_fix.theme.css
index add71e4913..eb462388ba 100644
--- a/core/modules/outside_in/tests/modules/outside_in_test_css/css/css_fix.theme.css
+++ b/core/modules/outside_in/tests/modules/outside_in_test_css/css/css_fix.theme.css
@@ -6,18 +6,19 @@
  * Remove all transitions for testing.
  */
 * {
+  /* CSS transitions. */
   -o-transition-property: none !important;
   -moz-transition-property: none !important;
   -ms-transition-property: none !important;
   -webkit-transition-property: none !important;
   transition-property: none !important;
-  /*CSS transforms*/
+  /* CSS transforms. */
   -o-transform: none !important;
   -moz-transform: none !important;
   -ms-transform: none !important;
   -webkit-transform: none !important;
   transform: none !important;
-  /*CSS animations*/
+  /* CSS animations. */
   -webkit-animation: none !important;
   -moz-animation: none !important;
   -o-animation: none !important;