It would make an outstanding call-to-action button. Borders in CSS are old news, but maybe you didn’t know that border images and gradient borders are also possible with CSS now, thanks to two properties: border-image-source and border-image-slice.
Here’s a solution that offers a smooth animated border. There are three properties of a border you can change − The border-color specifies the color of a border.. Attention Getter. You can use images that replace the default border style.