body {
  background-color: #1e1e1e;
  color: #cfd8dc;
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

header {
  background-color: #111;
  display: flex;
  align-items: center;
  padding: 10px 20px;
}

header .logo {
  height: 50px;
  margin-right: 20px;
}

nav a {
  color: #a5d6a7;
  margin-right: 20px;
  text-decoration: none;
  font-weight: bold;
}

nav a:hover {
  color: #81c784;
}

main {
  padding: 20px;
}

footer {
  background-color: #111;
  text-align: center;
  padding: 10px;
  color: #888;
  position: fixed;
  bottom: 0;
  width: 100%;
}