a.letras
{
    font-family: Arial, Helvetica, sans-serif;
    font-size: 18px;
    font-weight: bold;
    color: #3582DF;
    text-decoration: none;
}
a.letras:hover
{
    background-color: #1A5CAA;
    color: #FFFFFF;
}
a.marcas
{
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
    font-weight: bold;
    color: #000000;
    text-decoration: none;
}
a.marcas:hover
{
    color: #1A5CAA;
}