css clicked button should look like default code example

Example: css button no style

button {
  background: transparent;
  box-shadow: 0px 0px 0px transparent;
  border: 0px solid transparent;
  text-shadow: 0px 0px 0px transparent;
}

button:hover {
  background: transparent;
  box-shadow: 0px 0px 0px transparent;
  border: 0px solid transparent;
  text-shadow: 0px 0px 0px transparent;
}

button:active {
  outline: none;
  border: none;
}

button:focus {
  outline: 0;
}