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

body {
  line-height: 1.6;
  background-color: #f9f9f9;
  color: #333;
}

header {
  background-color: #1d1d1d;
  color: white;
  padding: 40px 20px;
  text-align: center;
}

header .btn {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 25px;
  background-color: #00aaff;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}

.container {
  max-width: 1000px;
  margin: auto;
  padding: 20px;
}

section {
  padding: 40px 20px;
  background: white;
  border-bottom: 1px solid #ddd;
}

section:nth-child(even) {
  background-color: #f0f0f0;
}

ul {
  list-style-type: none;
  padding-left: 0;
}

ul li {
  margin-bottom: 10px;
  font-size: 1.1em;
}

#contact a {
  color: #0077cc;
  text-decoration: none;
}

footer {
  text-align: center;
  padding: 20px;
  background: #1d1d1d;
  color: white;
}