Question

If table is set to have a border on a high level, how can i make sure that classes inhering from it do not have any borders set?

table,td,th {
    border: 1px solid #0B6121;
}

how can i make sure that my other table has no borders at all?

table.menu {
    border: none;
    - and no border for td
    - and no border for th
}

Answer 1

table.main, table.menu td, table.menu td {
    border: none;
}

This way I guess. The idea is to set rules for siblings of your particular table.