Use `url(‘…’)` for images or `linear-gradient(…)` for gradients.
The inward offsets from the top, right, bottom, and left edges of the image. (e.g., 30 means 30px or 30%)
The width of the border image. Also sets `border-width`.
The amount by which the border image extends beyond the border box.
How the edge regions of the image are adjusted.
Preview Box