* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: "Poppins", sans-serif;
}
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: #000000;
  color: #ffffff;
  padding: 15px 0;
  z-index: 1000;
  display: flex;
  justify-content: center;
}
nav {
  display: flex;
  gap: 40px;
}
nav a {
  text-decoration: none;
  color: #ffffff;
  font-size: 18px;
  transition: color 0.3s ease;
}
nav a.active {
  color: #4747ff;
}
section {
  height: 100vh;
  padding: 50px 20px;
}
section:nth-child(odd) {
  background-color: #f7f7f7;
}
section:nth-child(even) {
  background-color: #e2e2e2;
}
section h2 {
  font-size: 36px;
}
section p {
  font-size: 18px;
  line-height: 1.7;
}