body, h1, h3, p, ol, li, a, code {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: #f4f7f9;
  color: #333;
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  padding: 20px;
}

h1 {
  font-size: 2.5rem;
  color: #333;
  text-align: center;
  margin-bottom: 20px;
  font-weight: normal;
}

p {
  font-size: 1.2rem;
  color: #555;
  text-align: center;
  margin-bottom: 20px;
}

ol {
  margin: 0 auto;
  max-width: 600px;
  padding-left: 20px;
  font-size: 1.1rem;
  color: #333;
}

ol li {
  margin-bottom: 10px;
}

code {
  background-color: #f0f0f0;
  padding: 3px 6px;
  border-radius: 3px;
  font-family: 'Courier New', monospace;
}

a {
  color: #007bff;
  text-decoration: none;
  text-align: center;
}

a:hover {
  color: #0056b3;
  text-decoration: underline;
}

h3 {
  font-size: 1.5rem;
  color: #666;
  text-align: center;
  margin-top: 20px;
}

br {
  margin-bottom: 15px;
}

body {
  max-width: 900px;
  margin: 0 auto;
  background-color: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

@media screen and (max-width: 600px) {
  body {
    padding: 15px;
  }

  h1 {
    font-size: 2rem;
  }

  p, ol, h3 {
    font-size: 1rem;
  }
}