html, body {
      height: 100%;
      margin: 0;
      text-align: center;
      background-color: black;
    }

#center {
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100%;
    }

#message {
  font-family: verdana;
  font-size: 30px;
  color: lightgreen;
}

button {
      width: 100px;
      height: 100px;
      font-size: 70px;
      background-color: lightyellow;
	  color: red;
    }

button:hover {
  background-color: lightblue;
}

button:active {background-color: black;}

.b_new {
  font-family: arial;
  font-size: 20px;
  background-color: orange;
}