h1, h2, h3, h4, h5, h6, .h1, .h2, .h3, .h4, .h5, .h6 {
    font-family: Arial,Helvetica,sans-serif;
}
nav, .navigation, .nav, .nav-block, .navbar {
    font-family: Arial,Helvetica,sans-serif;
}
/* body=,header=Arial,navbar=Arial */