? Border Images in CSS

The border-image property lets you use an image as the border of an element instead of a plain color or style. It’s a powerful way to create decorative or custom borders.

Core Properties for Border Images

• border-image-source: The image to use as a border.

• border-image-slice: How to slice the image into parts for corners and edges.

• border-image-width: Width of the border image areas.

• border-image-outset: How far the border image extends beyond the border box.

• border-image-repeat: How to fill the edges (stretch, repeat, round).

Basic Syntax

.element {  border-style: solid; /* Required */  border-width: 30px;  /* Controls border area size */  border-image-source: url(border.png);  border-image-slice: 30; /* Slice the image into 9 parts */  border-image-repeat: stretch; /* or repeat, round */}

How border-image-slice Works

The border image is divided into 9 sections:

+-----+-------+-----+| TL  |  T    | TR  |+-----+-------+-----+| L   | center|  R  |+-----+-------+-----+| BL  |  B    | BR  |+-----+-------+-----+

• The numbers you give in border-image-slice specify where to slice the image on the top, right, bottom, and left.

• These slices are used to place corners and edges around the element.

Full Example:

.box {  border-style: solid;  border-width: 40px;  border-image-source: url('frame.png');  border-image-slice: 40;  border-image-repeat: round;}

Useful Notes:

• You must specify a border-style other than none for the border image to appear.

• If you want different slice values for each side, you can specify up to 4 numbers, e.g., border-image-slice: 30 20 30 20;

• border-image-repeat options:

  • stretch (default): stretches edge slices to fill the border.

  • repeat: repeats the edge slices.

  • round: repeats but scales the slices to fit evenly.

  • space: repeats with space between slices.

Example with multiple slice values and repeat:

.box {  border-style: solid;  border-width: 30px;  border-image-source: url('border.png');  border-image-slice: 30 20 30 20 fill;  border-image-repeat: repeat;}

If you want, I can help you create a border image effect with your own image or a demo!