* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  background-color: #f4f4f4;
  color: #333;
  line-height: 1.6;
}

header {
  background: #003366;
  color: #fff;
  padding: 20px 0;
  text-align: center;
}

header .btn {
  display: inline-block;
  margin-top: 10px;
  padding: 10px 20px;
  background: #ffcc00;
  color: #003366;
  text-decoration: none;
  border-radius: 5px;
}

.container {
  width: 80%;
  margin: auto;
  overflow: hidden;
  padding: 20px 0;
}

#features {
  background: #f4f4f4;
  padding: 20px 0;
}

.feature {
  margin-bottom: 20px;
}

.feature h3 {
  margin-bottom: 10px;
  color: #003366;
}

#download {
  background: #003366;
  color: #fff;
  padding: 20px 0;
  text-align: center;
}

#download .btn {
  display: inline-block;
  margin: 10px 10px 0 0;
  padding: 10px 20px;
  background: #ffcc00;
  color: #003366;
  text-decoration: none;
  border-radius: 5px;
}

footer {
  background: #333;
  color: #fff;
  text-align: center;
  padding: 10px 0;
  margin-top: 20px;
}

footer a {
  color: #ffcc00;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}