title: How to target Safari for Mac only?
body: <p>Hi I've cross browser fixed a site on all thinkable PC browsers, including Safari.
  Now my smart ass designer sent me a screen shot of the whole layout collapsing on mac. 
  I have an idea how to solve it (reduce the margin on an element by a few pix), but i don't know how to target Safari only, preferably Safari mac only.<br>
  What's the best way to do this?</p>