a {
  color: orange;
}

h1{
  text-align: center;
  font-size: 100px;
}

nav {
  width: 250px;
  background: gray;
  font-size: 24px;
}

/*
img{
  display: block;
  margin-left: auto;
  margin-right: auto;
  border-radius: 8px;
  width: 600px;
  height: 500px;
}
*/

img{
  display: block;
  margin-left: auto;
  margin-right: auto;
  border-radius: 8px;
  max-width:640px;
  max-height:480px;
  width: auto;
  height: auto;
}

article {}