Animated copy button in pure css

<button></button>

button {
  height: 5rem;
  width: 5rem;
  position: relative;
  
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 5px;
  border: solid 3px black;
  
  background-color: lightgray;
  background-image: url("https://cdn-icons-png.flaticon.com/512/178/178921.png");
  background-repeat: no-repeat;
  background-size: contain;
  background-origin: content-box;
  
  transition: background-image 0s 2s;
}

button:active {
  background-image: url("https://cdn-icons-png.flaticon.com/512/18/18442.png");
  transition-delay: 0s;
}

button:active::after {
  opacity: 1;
  transition: opacity 0s 0s;
}

button::after {
  content: 'Copied';
  position: absolute;
  bottom: -2.5rem;
  right: 50%;
  transform: translate(50%, 0);
  
  color: white;
  padding: 0.5rem;
  border-radius: 0.5rem;
  background-color: gray;
  
  opacity: 0;
  transition: opacity 0.2s 2s;
}

button {
  height: 5rem;
  width: 5rem;
  position: relative;

  cursor: pointer;
  padding: 0.5rem;
  border-radius: 5px;
  border: solid 3px black;

  background-color: lightgray;
  background-image: url("https://cdn-icons-png.flaticon.com/512/178/178921.png");
  background-repeat: no-repeat;
  background-size: contain;
  background-origin: content-box;

  transition: background-image 0s 2s;

  &:active {
    background-image: url("https://cdn-icons-png.flaticon.com/512/18/18442.png");
    transition-delay: 0s;

    &::after {
      opacity: 1;
      transition: opacity 0s 0s;
    }
  }

  &::after {
    content: 'Copied';
    position: absolute;
    bottom: -2.5rem;
    right: 50%;
    transform: translate(50%, 0);

    color: white;
    padding: 0.5rem;
    border-radius: 0.5rem;
    background-color: gray;

    opacity: 0;
    transition: opacity 0.2s 2s;
  }

}