html,
body,
div {
  margin: 0px;
  border: none;
  padding: 0px;
  width: 100dvw;
  height: 100dvh;
  text-align: center;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

div {
  width: fit-content;
  height: fit-content;
}

button {
  border: none;
  padding: 3px;
  background-color: black;
  color: white;
  font-family: Courier New;
  border-radius: 3px;
}