body {
  text-align: center;

  width: 300px;
  height: 100px;
  padding: 20px;

  position: absolute;
  top: 50%;
  left: 50%;

  margin: -70px 0 0 -170px;
}

button {
  background-color: #eeeeee;
  border: none;
  color: black;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
}