Issue #2422359 by mortendk: seven module-page.css css lint fix

core/themes/seven/css/components/modules-page.css

 /* Modules page */
-#system-modules fieldset {
+.system-modules fieldset {
   border: 0;
   border-top: 1px solid #ccc;
 }
-#system-modules details {
+.system-modules details {
   border: 0;
   margin: 0;
   padding: 0;
 }
-#system-modules summary {
+.system-modules summary {
   border-bottom: 1px solid #ccc;
 }
-#system-modules [open] summary {
+.system-modules [open] summary {
   border-bottom: none;
 }
-#system-modules .details-wrapper {
+.system-modules .details-wrapper {
   padding: 0 0 0.5em 0;
 }
-#system-modules .fieldset-wrapper {
+.system-modules .fieldset-wrapper {
   padding: 0;
 }
-#system-modules table,
-#locale-translation-status-form table {
+.system-modules table,
+.locale-translation-status-form table {
   border: 0;
 }
-#system-modules tr.even,
-#system-modules tr.odd,
-#locale-translation-status-form tr.even,
-#locale-translation-status-form tr.odd {
+.system-modules tr.even,
+.system-modules tr.odd,
+.locale-translation-status-form tr.even,
+.locale-translation-status-form tr.odd {
   background: #f3f4ee;
   border: 0;
   border-bottom: 10px solid #fff;
 }
-#system-modules tr td:last-child,
-#locale-translation-status-form tr td:last-child {
+.system-modules tr td:last-child,
+.locale-translation-status-form tr td:last-child {
   border: 0;
 }
-#system-modules table th,
-#locale-translation-status-form table th {
+.system-modules table th,
+.locale-translation-status-form table th {
   border: 0;
   border-bottom: 10px solid #fff;
 }
-#system-modules .sticky-header th,
-#locale-translation-status-form .sticky-header th {
+.system-modules .sticky-header th,
+.locale-translation-status-form .sticky-header th {
   border: 0;
 }