@charset "UTF-8";
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-image: url("虚無.webp");
  background-repeat: repeat;
}

header {
  background-color: #333;
  color: #fff;
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
header h1 {
  margin: 0;
}
header nav {
  background-color: #444;
  color: #fff;
  padding: 1rem;
  text-align: center;
}
header nav ul {
  list-style: none;
}
header nav a {
  color: #fff;
  text-decoration: none;
  margin: 0 1rem;
}
header nav a:hover {
  text-decoration: underline;
}

main {
  padding: 2rem;
}