body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

header {
  background-color: #f3f3f3;
  display: flex;
  justify-content: space-between;
  padding: 10px 20px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header-left h1 {
  margin: 0;
}

.header-right ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
}

.header-right ul li {
  margin-left: 20px;
}

.header-right ul li a {
  text-decoration: none;
  color: #333;
}

main {
  padding: 20px;
}

main section h2 {
  margin-top: 0;
}