a border-style property set to none.

a border-style property set to solid.

a border-style property set to dotted.

a border-style property set to dashed.

a border-style property set to double.

a border-style property set to groove.

a border-style property set to ridge.

a border-style property set to inset.

a border-style property set to outset.

a border-style property set to hidden.