html,body{
    height: 100%;
    display: flex;
    align-items: center;
    flex-direction: row;
    justify-content: center;
}
h1{
    position: absolute ;
    top: 2px;
    text-align: center;
    font-size: 50px;
}
#main{
    text-align: center;
    font-size: 30px;
}
a:link {
    color : navy;
  }
  a:visited {
    color : brown;
  }
  a:hover {
    color : royalblue;
  }
  a:active {
    color : green
  }