* {
  box-sizing: border-box;
}

body {
 background-color: powderblue;
  font-family: Arial, Helvetica, sans-serif;
}





img {
width: 30%;
height: auto;

}


footer {
  background-color: #777;
  padding: 10px;
  text-align: center;
  color: white;
}

@media (max-width: 600px) {
  nav, article {
    width: 100%;
    height: auto;
  }
}