body {
  margin: 0;
  font-family: Arial, sans-serif;
  display: flex;
  min-height: 100vh;
}
nav {
  width: 200px;
  background-color: #333;
  color: white;
  flex-shrink: 0;
  padding-top: 20px;
}
nav ul {
  list-style-type: none;
  padding: 0;
}
nav ul li {
  margin: 10px 0;
}
nav ul li a {
  color: white;
  text-decoration: none;
  display: block;
  padding: 10px;
}
nav ul li a:hover {
  background-color: #111;
}
main {
  flex-grow: 1;
  padding: 20px;
  background-color: #f4f4f4;
}
header, footer {
  background-color: #F38020;
  color: white;
  text-align: center;
  padding: 1em;
}
header img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto 10px auto;
}
@media (max-width: 600px) {
  body {
    flex-direction: column;
  }
  nav {
    width: 100%;
  }
}