[Plugin: Sociable] How to Center with css

I was wondering how I can center the whole images as a whole using css please see my site at http://www.thelucrativeinvestor.com/states-with-lower-than-average-unemployment-rates/ . I want them to align to the center also maybe add some more spacing between the images as well. I inserted the css file into my own css file but so far am not hacing any luck. Also I find that it would be good if this plugin used a css sprite to help lower the http requests for faster page loading.

div.sociable { margin: 16px 0; }

span.sociable_tagline { position: relative; }
span.sociable_tagline span { display: none; width: 14em; }
span.sociable_tagline:hover span {
position: absolute;
display: block;
top: -5em;
background: #ffe;
border: 1px solid #ccc;
color: black;
line-height: 1.25em;
}
.sociable span {
display: block;
}
.sociable ul {
display: inline;
margin: 0 !important;
padding: 0 !important;
}
.sociable ul li {
background: none;
display: inline !important;
list-style-type: none;
margin: 0;
padding: 1px;
}
.sociable ul li:before { content: “”; }
.sociable img {
float: none;
width: 16px;
height: 16px;
border: 0;
margin: 0;
padding: 0;
}

.sociable-hovers {
opacity: .4;
-moz-opacity: .4;
filter: alpha(opacity=40);
}
.sociable-hovers:hover {
opacity: 1;
-moz-opacity: 1;
filter: alpha(opacity=100);
}