button {
  position: relative;
  background: #FBD148;
  box-sizing: border-box;
  border: 0;
  outline: 0;
  padding: 1rem 3rem;
  font-size: 1em;
  cursor: pointer;
  transition: .25s ease;
}

button::before {
  position: absolute;
  content: '';
  box-sizing: border-box;
  top: 0;
  left: 0;
  transform: translate(-5px, -5px);
  width: 100%;
  height: 100%;
  border: 1px solid rgb(84, 84, 84);
  transition: .25s ease;
}

button:hover {
  transform: translate(-5px, -5px);
}

button:hover::before {
  transform: translate(5px, 5px);
}