div#activities_wrapper {
    margin-left: auto;
    margin-right: auto;
    width:550px;
    height:50px;
    padding:0;
}

ul#activities {
    list-style: none;
}

ul#activities li {
    float: left;
    text-align:left;
    margin: 0px 10px 0px 10px;
    padding: 0;
    width:150px;
    height:50px;
}