body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f9f9f99;
  color: #444;
}
header {
  background: #107a2d;
  color: white;
  padding: 15px;
  text-align: center;
}
nav a {
  color: white;
  margin: 0 10px;
  text-decoration: none;
  font-weight: bold;
}
.hero {
  padding: 40px;
  text-align: center;
  background: #dff5e4;
}
.btn {
  display: inline-block;
  margin-top: 20px;
  padding: 10px 20px;
  background: #107a2d;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}
section {
  padding: 20px;
  max-width: 800px;
  margin: auto;
}
footer {
  background: #eee;
  text-align: center;
  padding: 10px;
  margin-top: 20px;
}