body {
    background-color: gray;
}

  h1 {
    font-size: 32px;
    font-family: Helvetica;
    text-align: center;
  }

 h2 {
    font-size: 32px;
    font-family: Helvetica;
   text-align: center;
  }

<graphics>
#button1 {
  border: 1px solid #00ff00;
  color: #ff0000;
  background: #fff000;
  background: 
}

.button {
    background-color: black;
    border: white;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 24px;
    margin: 4px 2px;
    cursor: pointer;
}
  .message {
    font-size: 32px;
    text-align: center;
    w3-round-large;
    
  }

  .buttonContainer 
{
  text-align: center;
  align: center;
}