Adding node preview css.

Closes #3214332

core/themes/claro/css/components/action-link.css

@@ -508,3 +508,15 @@
 .action-link--icon-questionmark.action-link--danger:active::before {
   background-image: url("data:image/svg+xml,%3csvg width='15' height='14' fill='none' xmlns='http://www.w3.org/2000/svg'%3e%3cpath d='M7.002 0a7 7 0 100 14 7 7 0 000-14zm3 5c0 .551-.16 1.085-.477 1.586l-.158.22c-.07.093-.189.241-.361.393a9.67 9.67 0 01-.545.447l-.203.189-.141.129-.096.17L8 8.369v.63H5.999v-.704c.026-.396.078-.73.204-.999a2.83 2.83 0 01.439-.688l.225-.21-.01-.015.176-.14.137-.128c.186-.139.357-.277.516-.417l.148-.18A.948.948 0 008.002 5 1.001 1.001 0 006 5H4a3 3 0 016.002 0zm-1.75 6.619a.627.627 0 01-.625.625h-1.25a.627.627 0 01-.626-.625v-1.238c0-.344.281-.625.626-.625h1.25c.344 0 .625.281.625.625v1.238z' fill='%23ab1b1b'/%3e%3c/svg%3e");
 }
+
+.action-link--icon-chevron-left::before {
+  display: block;
+  content: "";
+  background-image: url("data:image/svg+xml,%3csvg width='16' height='16' fill='none' xmlns='http://www.w3.org/2000/svg'%3e%3cpath d='M11 2L5 8l6 6' stroke='%23545560' stroke-width='2'/%3e%3c/svg%3e");
+}
+
+@media (min-width: 30em) {
+  .action-link--icon-chevron-left::before {
+    display: inline-block;
+  }
+}