body {
  background-color: #f0f7f9;
  font-family: Arial, sans-serif;
  color: #2b3a4a;
  margin: 0;
  padding: 0;
}

header {
  background-color: #dbe4ee;
  padding: 15px;
  text-align: center;
  border-bottom: 3px solid #b8c0ff;
}

nav a {
  color: #5b8fb9;
  text-decoration: none;
  font-weight: bold;
  margin: 0 10px;
}

section {
  background-color: #ffffff;
  padding: 20px;
  margin: 20px auto;
  width: 650px;
  border-left: 5px solid #a0e4b8;
}

h1 {
  color: #5b8fb9;
}

h2 {
  color: #4a6fa5;
}