Actually I am on 1.10.4. Sorry for the confusion. The CSS you sent made no difference in the ticket view.

I've confirmed that the above code does work in 1.10.4. You may need to clear your browser cache to see the change. It is also possible that the change is too subtle and you are not noticing the difference. To make it more obvious you can try something like this:

a.Icon.Ticket.preview b, a.Icon.emailTicket.preview b, a.Icon.phoneTicket.preview b, a.Icon.webTicket.preview b, a.Icon.otherTicket.preview b {
    font-weight: 700;
  font-size: 10px;
  font-family: 'Open Sans', sans-serif;
  color: #ffffff;
  background: #30a400;
}


But what I really recommend is to upgrade to 1.12.x.

Ok so I upgraded it to 1.12.2..

default store worked fine.

But as soon as I uload your theme files, I get 403 error for user interface, and 404 for admin interface (/scp/).

Can you check please?

Please ignore the last reply. It was a local issue.

Glad you've got it sorted!