I'm surprised by the lack of spaces in, say,

  .error{ color:red; }

I much prefer

  .error { color: red; }

or

  .error {
    color: red;
  }

(The latter is particularly nice because it implicitly acknowledges the likelihood that additional rules will be added.)

I don't recall seeing the space-compressed version much in the old days. Is it a new trend? I don't like it.