body {
  background-color: black;
  color: white;
  font-family: "Yu Gothic", "メイリオ", sans-serif;
  font-size: 16px;       /* 普通サイズ */
  line-height: 1.6;
  margin: 2em;
}

h1 {
  text-align: center;
  margin-bottom: 1em;
}

#diary pre {
  font-size: 16px;       /* 普通サイズに統一 */
  line-height: 1.6;
  font-family: "Yu Gothic", "メイリオ", sans-serif;
  white-space: pre-wrap;
  word-wrap: break-word;
  margin-bottom: 2em;
}

a {
  color: #ccc;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

footer {
  text-align: center;
  margin-top: 2em;
  font-size: 0.9em;
  color: #aaa;
}