* {
  background-color: transparent;
}

window {
  margin-bottom: 25px;
}

button {
  background-color: black;
  border: 3px solid white;
  border-radius: 15px;
  background-color: black;
  margin: 0;
  padding: 0;

  min-width: 94px;
  min-height: 94px;
}

button > * {
  background-color: black;
  color: white;
  border-radius: 15px;
  font-size: 20px;
}