body {
  background-color: #333333;
  color: white;
  font-family: 'Playfair Display', serif;
  text-align: center;
  margin: 0;
  padding: 0;
}

h1 {
  color: white;
  font-size: 2.5rem;
}

a {
  color: lightblue;
  text-decoration: none;
}

/* 元のスタイルでサイドバー風に縦に並ぶように */
.sidebar {
  background-color: #000000;
  padding: 15px;
  border-radius: 8px;
  font-family: monospace;
  margin: 20px auto;
  width: fit-content;
}

.sidebar h2 {
  font-size: 18px;
  margin-bottom: 10px;
  text-align: center;
  color: #FFFFFF;
}

.sidebar a {
  display: block;
  margin: 5px 0;
  text-decoration: none;
  color: #333;
  font-weight: bold;
  padding: 5px;
  border-radius: 4px;
  transition: background-color 0.2s;
}

.sidebar a:hover {
  background-color: #d0ccff;
}