Changing The Background Back?

I was testing some things out on my installation, and changed, in /view/default/css.php the background in the following part of the file from the default color to black:

body {
    margin:0 auto;
    background: #dedede;
    font: 80%/1.4  "Lucida Grande", Verdana, sans-serif;
    color: #333333;

(This is in the defaults section. I changed #dedede to "black.")

Now, it won't change back to the default background color. It's stuck on black. Any suggestions?

Also, I was wondering if it were possible to have a gradient like the following in place of just one background color:

 background-color: #ADC3DC;
        background: -webkit-gradient(radial, 50% 50%, 0, 50% 50%, 100, from(#7094D0), color-stop(0.5, #D7EAF4), to(#ADC3DC));
        background: -moz-radial-gradient(50% 50%, farthest-side, #7094D0, #D7EAF4, #ADC3DC);