Clean up CSS

This kind of CSS is pointless and crappy:

  /* Firefox v3.6+ */
  background-image:-moz-linear-gradient(26% 0% -90deg,rgb(245,245,245) 0%,rgb(204,204,204) 100%);
  /* safari v4.0+ and by Chrome v3.0+ */
  background-image:-webkit-gradient(linear,26% 0%,26% 94%,color-stop(0, rgb(245,245,245)),color-stop(1, rgb(204,204,204)));
  /* Chrome v10.0+ and by safari nightly build*/
  background-image:-webkit-linear-gradient(-90deg,rgb(245,245,245) 0%,rgb(204,204,204) 100%);
  /* Opera v11.10+ */
  background-image:-o-linear-gradient(-90deg,rgb(245,245,245) 0%,rgb(204,204,204) 100%);
  /* IE v10+ */
  background-image:-ms-linear-gradient(-90deg,rgb(245,245,245) 0%,rgb(204,204,204) 100%);
  background-image:linear-gradient(-90deg,rgb(245,245,245) 0%,rgb(204,204,204) 100%);

E.g. Firefox unprefixed this a while ago, Opera also, the old Webkit syntax is pointless to support, Microsoft apparently never implemented it (thanks @jessebeach, didn't know).