* {
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
}

body {
  margin: 0;
  background: #f4f6f8;
  color: #222;
}

header {
  background: #111;
  color: #fff;
  text-align: center;
  padding: 40px 20px;
}

header h1 {
  margin: 0;
  font-size: 2.2em;
}

section {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
}

h2 {
  color: #111;
}

ul {
  padding-left: 20px;
}

.btn {
  display: inline-block;
  margin-top: 15px;
  padding: 12px 20px;
  background: #e63946;
  color: white;
  text-decoration: none;
  border-radius: 5px;
  font-weight: bold;
}

.btn.whatsapp {
  background: #25D366;
}

footer {
  background: #111;
  color: #ccc;
  text-align: center;
  padding: 20px;
  font-size: 0.9em;
}