body {
  background: #d9e2ee;
  font-family: Arial, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  color: #222;
}

.header {
  background: linear-gradient(#00345a, #00223d);
  color: white;
  padding: 18px 30px;
  font-size: 24px;
  border-bottom: 3px solid #00182d;
}

nav {
  background: #f3f6fb;
  padding: 12px 26px;
  border-bottom: 1px solid #c8d2e0;
}

nav a {
  margin-right: 20px;
  text-decoration: none;
  color: #00345a;
  font-weight: bold;
}

.container {
  padding: 30px;
}

.box {
  background: white;
  border: 1px solid #c6ccd7;
  padding: 25px;
  width: 750px;
  box-shadow: 0 0 8px rgba(0,0,0,0.08);
}

.input {
  width: 260px;
  padding: 10px;
  border: 1px solid #9aa6b8;
  border-radius: 4px;
  margin-bottom: 12px;
}

.button {
  background: #00345a;
  color: white;
  padding: 10px 20px;
  border: none;
  margin-top: 10px;
  cursor: pointer;
  border-radius: 4px;
}