* {box-sizing:border-box}
* {font-family: 'Courier New', Courier, monospace;}
* body{
  background-color: #ffff80;
}
/* unvisited link */
a:link {
    color: red;
  }
  
  /* visited link */
  a:visited {
    color: green;
  }
  
  /* mouse over link */
  a:hover {
    color: rgb(144, 53, 68);
  }
  
  /* selected link */
  a:active {
    color: blue;
  }
  h1,h2,h3,h4,h5,h6{
    text-align: center;
}
.intro{
    font-size: 100%;
    text-align: center;
}
.navegacao{
    font-size: 150%;
    text-align: center;
}