CodePen Embed - CSS Inner Border Issue

<div> MURAT </div>
<div> ÖNER </div>

div {
  background-color: #000;
  color: #fff;
  display: inline-block;
  padding: 5px;
  font-weight: bolder;
}
div:hover {
  background-color: #fff;
  color: #000;
  box-shadow: inset 0px 0px 0px 4px #000;
}

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