body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
}

header {
  background-color: #2c3e50;
  color: white;
  padding: 15px;
  text-align: center;
}

nav {
  background-color: #34495e;
  overflow: hidden;
}
nav a {
  float: left;
  display: block;
  color: white;
  text-align: center;
  padding: 14px 20px;
  text-decoration: none;
}
nav a:hover {
  background-color: #1abc9c;
}

main {
  padding: 20px;
  min-height: 400px;
  background: white;
}

footer {
  background-color: #2c3e50;
  color: white;
  text-align: center;
  padding: 10px;
  position: relative;
  bottom: 0;
  width: 100%;
}