body {
  font-family: "Yu Gothic", "メイリオ", Meiryo, sans-serif;
  background-image: url(01.png);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  color: #333;
  line-height: 1.6;
  padding: 2rem;
  max-width: 800px;
  margin: auto;
  background-color: rgba(255, 255, 255, 0.85); /* fallback for readability */
}

h1 {
  background-color: rgba(255, 255, 255, 0.85);
  color: #2c3e50;
  padding: 0.5rem;
  border-radius: 4px;
}

a {
  color: #006699;
  text-decoration: underline;
}

a:focus, a:hover {
  outline: 2px solid #006699;
  background-color: #eef;
}


li {
  margin-bottom: 5px;
}