topborder
nounUK /ˈtɒpˌbɔːdə/
US /ˈtɑːpˌbɔːrdər/
The top edge or line that goes around the upper part of something.
The picture has a red topborder and a blue bottom border.
OTHER MEANINGS
2. The upper decorative strip along the top of a page or screen.
The website's topborder shows the company logo.
3. The highest row of bricks or stones in a wall.
The mason checked that the topborder was level.
4. In gardening, the row of plants along the upper edge of a bed.
She planted tulips along the topborder of the flower bed.