body, html {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

nav {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: #333;
  color: white;
  z-index: 1000;
  transition: background-color 0.3s;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
}

nav ul li {
  margin: 0 20px;
}

nav ul li a {
  color: white;
  text-decoration: none;
  padding: 15px 0;
  display: block;
  transition: background-color 0.3s, color 0.3s;
}

nav ul li a:hover {
  background-color: #575757;
  color: #fff;
}

.section {
  height: 100vh;
  padding-top: 60px;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

#home {
  background-color: #f4f4f4;
}

#about {
  background-color: #e4e4e4;
}

#services {
  background-color: #d4d4d4;
}

#portfolio {
  background-color: #c4c4c4;
}

#team {
  background-color: #b4b4b4;
}

#contact {
  background-color: #a4a4a4;
}