div.tabs {
width: 70%;
margin-left: 15%;
}

div.tab, a.tab {
width: 24%;
float: left;
padding: 15px 0px;
font-size: 1.4em;
font-weight: bold;
}

div.tab span, a.tab span {
padding: 10px 20px;
border: solid thin black;
color: #000;
background-color: #f5f5f5;
}

div.tab.active span, a.tab.active span {
color: #f5f5f5;
background-color: #000000;
}