ズレていたボタンの背景がマウスホバーで元に戻るエフェクト

Result

css

a {/*ボタン装飾。あとで疑似要素を重ねるのでz-indexを設定しておく*/
  position: relative;
  border: 6px solid #232323;
  z-index: 2;
  padding: 12px 22px;
  margin: 0 10px;
  box-sizing: border-box;
  font-size: 26px;
  font-weight: 600;
  text-transform: uppercase;
  text-decoration: none;
  color: #232323;
}
 a:hover:before{/*ホバーで元の位置に戻す*/
  top: 0;
  left: 0;
  width: 102%;
  height: 100%;
}
 a:active:before{
  top: -10px;
  left: 18px;
  width: 102%;
  height: 100%;
}
 a:before {/*背景を疑似要素で作成し、ずらす*/
  content: "";
  position: absolute;
  z-index: -1;
  top: 12px;
  left: -14px;
  width: calc(100% + 6px);
  height: calc(100% + 6px);
  background-color: #f9d159;
  transition: all 0.3s ease;
}

html

<div class="wrapper">
  <div class="row">
     <a href="#" class="btn-yellow">Hello</a>
    <a href="#" class="btn-red">Hallo</a>
   </div>
</div>

via

https://codepen.io/petter/pen/rVaErz

codepen.io