The phrase "bottom border" refers to a line or boundary at the bottom of something, like a page, box, or cell, which marks the bottom edge or limit of that particular object. Full definition
It has most of the latest features of other contemporary phones, including narrow top and bottom borders around its screen, as well as a metallic back. (businessinsider.com)
Its thick bottom border picks up the window's black frame, and an identical line runs along the walls at exactly the same height. (haberarts.com)
It has most of the latest features of other contemporary phones, including narrow top and bottom borders around its screen, as well as a metallic back. (businessinsider.my)