@media only screen and (min-width: 1366px) and (max-width: 1600px) {
    nav.main_menu > ul > li > a {
        padding: 0 25px !important;
    }
}
@media only screen and (min-width: 1000px) and (max-width: 1280px) {
    nav.main_menu > ul > li > a {
        padding: 0 16px !important;
        letter-spacing: 1px !important
    }
    .header_bottom {
        padding: 0 20px !important;
    }
}