#main_menu ul {
    font-size: 12px;
    font-family: Verdana, Arial, sans-serif;
    font-weight: bold;
    border: none;
    padding: 0;
    margin: 0;
}

#main_menu li {
    float:left;
    width: 212px;
    list-style-type: none;
    padding: 0;
    margin: 0;
    border: none;
}

#main_menu li a{
    display: block;
    padding: 0;
    margin: 0 20px;
    padding: 2px 0;
    text-align: center;
    border-top: 2px solid #e0e0e0;
    text-decoration: none;
    border-bottom: 4px solid #e0e0e0;
    color: gray;
}

#main_menu li a:hover{
    border-top: 2px solid gray;
    border-bottom: 4px solid gray;
}