Meta Post - Common CSS Hacks

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This should work

.nav-folder-children .nav-folder-children {
  margin-left: 20px;
  padding-left: 0;
  border-left: 1px solid rgba(118,158,165,0.2);
  border-radius: 4px;
  transition:all 0.5s ease-in-out;
}
.nav-folder-children .nav-folder-children:hover {
  border-left-color: rgba(118,158,165,0.4);
}