.mattblacktabs{
width: 100%;
border-top: 0px solid black; 
overflow: hidden;
border-bottom: 0px solid black; /*bottom horizontal line that runs beneath tabs*/
background: #000000;
}

.mattblacktabs ul
{
    margin: 0;
    padding: 0;
    padding-left: 10px; /*offset of tabs relative to browser left edge*/
    font: bold 16px;
    font-family: "Helvetica, Arial";
    list-style-type: none;
    font-size: 16px;
    font-weight: bold;
}

.mattblacktabs li{
display: inline;
margin: 0;
}

.mattblacktabs li a{
float: left;
display: block;
text-decoration: none;
margin: 0;
padding: 10px 11px; /*padding inside each tab*/
border-right: 0px solid white; /*right divider between tabs*/
color: white;
background: #000000; /*background of tabs (default state)*/
outline: none;
}

.mattblacktabs li a:visited{
color: white;
}

.mattblacktabs li a:hover, .mattblacktabs li.selected a{
background: #282828; /*background of tabs for hover state, plus tab with "selected" class assigned to its LI */
}