outline-offset

outline-offset: 4px;

outline-offset: 0.6rem;

outline-offset: 12px;
outline: 5px dashed blue;

<section class="default-example" id="default-example">
  <div class="transition-all" id="example-element">
    This is a box with an outline around it.
  </div>
</section>

#example-element {
  border: 2px solid crimson;
  outline: 0.75em solid;
  padding: 0.75em;
  width: 80%;
  height: 100px;
}

/* <length> 値 */
outline-offset: 3px;
outline-offset: 0.2em;
/* グローバル値 */
outline-offset: inherit;
outline-offset: initial;
outline-offset: revert;
outline-offset: revert-layer;
outline-offset: unset;

<p>Gallia est omnis divisa in partes tres.</p>

p {
  outline: 1px dashed red;
  outline-offset: 10px;
  background: yellow;
  border: 1px solid blue;
  margin: 15px;
}