CodePen Embed - qLxLev

<button>
  <span>Какаая то кнопка</span>
</button>

button{
  border:2px solid #ccc;
  background:#fff;
}

span{
  background:#ccc;
  display:inline-block;
  width:98%;
  margin:4px 0;
  padding:4px 0;
}
button:focus span{
  background:lightblue;
}

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