html {
    height: 100%;
    width: 100%;
  }
  body{
    text-align: center;
  }

  #message1-btn {
    display: block;
    font-size: 9vmin;
    width: 90%;
    height: 15vh;
    line-height: 15vh;
    text-align: center;
    margin: 0 auto 5%;
    background-color: white;
    color: black;
    border: 3px solid black;
    border-color: black;
    border-radius: 7vh;
    cursor: pointer;
  }
  
  #message1-btn:hover {
    background-color: black;
    color: white;
  }

  #message1-btn span {
    display: inline-block;
    vertical-align: middle;
  }
  
  #message2-btn{
    display: block;
    font-size: 9vmin;
    width: 90%;
    height: 15vh;
    line-height: 15vh;
    text-align: center;
    margin: 0 auto 5%;
    background-color: white;
    color: black;
    border: 3px solid black;
    border-radius: 7vh;
    cursor: pointer;
  }

  #message2-btn:hover {
    background-color: black;
    color: white;
  }

  #message3-btn{
    display: block;
    font-size: 9vmin;
    width: 90%;
    height: 15vh;
    line-height: 15vh;
    text-align: center;
    margin: 0 auto;
    background-color: white;
    color: black;
    border: 3px solid black;
    border-radius: 7vh;
    cursor: pointer;
  }

  #message3-btn:hover {
    background-color: black;
    color: white;
  }