* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: #333;
}
header {
  background: #00447c;
  color: #fff;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header h1 {
  font-size: 1.5rem;
}
header nav a {
  color: #fff;
  margin-left: 1rem;
  text-decoration: none;
}
#hero {
  background: #e3f2fd;
  text-align: center;
  padding: 2rem 1rem;
}
section {
  padding: 2rem 1rem;
}
section#mission {
  background: #f7f7f7;
}
footer {
  background: #222;
  color: #ddd;
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
}
@media (min-width: 600px) {
  body {
    max-width: 800px;
    margin: auto;
  }
}