* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  padding: 20px;
  background: #f4f4f4;
}

header {
  background: #333;
  color: #fff;
  padding: 10px 0;
  text-align: center;
}

header h1 {
  margin: 0;
}

main {
  max-width: 1200px;
  margin: 20px auto;
  background: #fff;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.introduction,
.coverage {
  margin-bottom: 20px;
}

.coverage-item {
  margin-bottom: 20px;
}

.coverage-item h3 {
  background: #333;
  color: #fff;
  padding: 10px;
  border-radius: 4px;
}

.coverage-item h4 {
  margin-top: 10px;
  margin-bottom: 5px;
  color: #333;
}

.coverage-item ul {
  list-style-type: disc;
  padding-left: 20px;
}

.coverage-item ul li {
  margin-bottom: 5px;
}

footer {
  text-align: center;
  margin-top: 20px;
  padding: 10px 0;
  background: #333;
  color: #fff;
  border-radius: 4px;
}

@media (max-width: 768px) {
  body {
    padding: 10px;
  }

  main {
    padding: 10px;
  }

  .coverage-item h3,
  .coverage-item h4 {
    font-size: 1.1em;
  }

  .coverage-item ul {
    padding-left: 15px;
  }
}