Round the corners of outline property CSS

Question

I have this element with this style added:

.checkout-step.current .number {
  background-color: #d26d51;
  outline: 1px solid #d26d51;
  outline-offset: 4px;
}

But I not want square corners in the outline, I want round the corners, like this example:

How can I do this?

Answer 1

My approach is as follows. Please check JSFiddle. I have added following HTML.

<a href="#">2</a>

I have added following css.

a {
  background: #999;
  width: 40px;
  height: 40px;
  border-radius: 20px;
  text-decoration: none;
  color: #fff;
  display: inline-block;
  line-height: 40px;
  position: relative;
  border: 2px solid #000;
  text-align: center;
}
a:after {
  content: '';
  display: block;
  position: absolute;
  top: -10px;
  bottom: -10px;
  left: -10px;
  right: -10px;
  border-radius: 30px;
  border: 2px solid #f00;
}