ul.tab-headers,
.tab-content {
    width: 100%; 
}
ul.tab-headers { 
    height: 20px;      
    list-style-type: none;
    margin: 0 0 0 15px;
    padding: 0;       
}
ul.tab-headers li {
    float: left;
    padding: 3px 10px 3px 10px;
    border: solid 1px black;
    border-bottom: 0;
    margin-left: 8px;
    cursor: pointer;
}
ul.tab-headers li.active {
    background-color:#2A71B4;
    color: white;
}
.tab-content {
    margin: 0 0 0 18px;
    padding: 0 5px 5px 5px;
    border: solid 1px black;
    visibility: hidden;
    background-color:#FFFFFF;
    color: #2A71B4;
}