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

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
  color: #333;
  background-color: #fdfdfd;
}

header {
  text-align: center;
  margin-bottom: 40px;
}

header .avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 10px;
}

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 10px;
}

nav ul li a {
  text-decoration: none;
  color: #0073e6;
}

section {
  margin-bottom: 30px;
}

section h2 {
  font-size: 1.5rem;
  margin-bottom: 10px;
  border-bottom: 2px solid #0073e6;
  display: inline-block;
  padding-bottom: 5px;
}

ul li {
  margin-bottom: 5px;
}

pre {
  background-color: #f4f4f4;
  padding: 10px;
  overflow-x: auto;
  border-left: 4px solid #0073e6;
}

footer {
  text-align: center;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid #ccc;
}

footer .logo {
  width: 40px;
  vertical-align: middle;
  margin-left: 10px;
}