body {
  background: black;
  margin: 0;
  display: grid;
  text-align: center;
  height: 100dvh;
  place-items: center;
  font-family: Optima, Candara, 'Noto Sans', source-sans-pro, sans-serif; 
  color: white;
  h1 {
    font-style: italic;
  }
 /* unvisited link */
  a:link {
    color: #DFFF00;
    text-decoration:none;
  }

  /* visited link */
  a:visited {
    color: #6F8000;
  }

  /* mouse over link */
  a:hover {
    color: hotpink;
  }
  
  /* selected link */
  a:active {
    color: blue;
  }
}