body {
  font-family: Arial, sans-serif;
  direction: rtl;
  margin: 20px;
}
header {
  background: #006837;
  color: #fff;
  padding: 20px;
  text-align: center;
}
section {
  margin-top: 20px;
}
nav ul {
  list-style: none;
  display: flex;
  gap: 10px;
  justify-content: center;
}
nav ul li a {
  text-decoration: none;
  color: #006837;
}