How to specify the bottom border of a ?

Question

I tried :

.bb {
    border-bottom:1px;
}

But no effect at all.

Answer 1

tr td 
{
    border-bottom: 2px solid silver;
}

or if you want the border inside the TR tag, you can do this:

tr td {
    box-shadow: inset 0px -2px 0px silver;
}