style.css not picking up changes – please help

Hi, Just installed my first wordpress blog and am just configuring it now. I am using the default theme and via the admin control panel/editor I have changed the style.css to change the background colour to the following:
/* Begin Typography & Colors */
body {
font-size: 62.5%; /* Resets 1em to 10px */
font-family: ‘Lucida Grande’, Verdana, Arial, Sans-Serif;
background: #454841;
color: #333;
text-align: center;
}
I am now totally lost as to why the change is not apparently being picked up. I have checked through file manager to see if I am editing the correct file and just to be certain it is the file wp-content/themes/default/style.css file that I have edited.

Can someone please point me in the right direction for this?

Oh just in case you need to see the test blog here it is http://davidpagephotography.com/wordpress/