ul#tabnav {
    /* general settings */
    text-align: left; /* set to left, right or center */
    margin: 1em 0 1em 0; /* set margins as desired */
    font: bold 13px arial, verdana, sans-serif; /* set font as desired */
    border-bottom: 1px solid #6c6; /* set border COLOR as desired */
    list-style-type: none;
    padding: 4px 10px 4px 10px; /* THIRD number must change with respect to padding-top (X) below */
}

ul#tabnav li {
    /* do not change */
    display: inline;
}

div#tab1 li.tab1, div#tab2 li.tab2, div#tab3 li.tab3, div#tab4 li.tab4 {
    /* settings for selected tab */
    border-bottom: 1px solid #fff; /* set border color to page background color */
    background-color: #fff; /* set background color to match above border color */
}

div#tab1 li.tab1 a, div#tab2 li.tab2 a, div#tab3 li.tab3 a, div#tab4 li.tab4 a {
    /* settings for selected tab link */
    background-color: #fff; /* set selected tab background color as desired */
    color: #000; /* set selected tab link color as desired */
    position: relative;
    top: 1px;
    padding-top: 4px; /* must change with respect to padding (X) above and below */
    padding-left: 10px;
    padding-right: 10px;
}

ul#tabnav li a {
    /* settings for all tab links */
    padding: 4px 4px; /* set padding (tab size) as desired; FIRST number must change with respect to padding-top (X) above */
    border: 1px solid #6c6; /* set border COLOR as desired; usually matches border color specified in #tabnav */
    background-color: #cfc; /* set unselected tab background color as desired */
    color: #666; /* set unselected tab link color as desired */
    margin-right: 0px; /* set additional spacing between tabs as desired */
    text-decoration: none;
    border-bottom: none;
    padding-left: 10px;
    padding-right: 10px;
}

ul#tabnav a:hover {
    /* settings for hover effect */
    background: #fff; /* set desired hover color */
}