body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f4f4f4;
}
nav ul {
  list-style: none;
  background: #333;
  padding: 10px;
  display: flex;
  justify-content: center;
}
nav ul li {
  margin: 0 15px;
}
nav ul li a {
  color: #fff;
  text-decoration: none;
}
.hero, .about, .projects, .contact {
  padding: 40px;
  text-align: center;
}
footer {
  background: #333;
  color: #fff;
  text-align: center;
  padding: 10px;
}
.btn {
  background-color: #007BFF;
  color: white;
  padding: 10px 15px;
  text-decoration: none;
  border-radius: 5px;
}
input, textarea {
  width: 300px;
}