border-image-outset
The CSS border-image-outset property sets distance between an element’s border-image
area and how far it goes beyond the element’s border-box.
.container {
border-style: ridge;
border-width: 3rem;
border-image-source: url('path/to/image.jpg');
border-image-slice: 70;
border-image-width: 40%;
border-image-repeat: repeat;
border-image-outset: 2;
}
…