html {
  scroll-behavior: smooth;
}
body {
  font-family:YakuHanJP,'Noto Sans CJK JP','Noto Sans JP',sans-serif,"游ゴシック","Yu Gothic",Yu Gothic,"Hiragino Kaku Gothic ProN","Hiragino Kaku Gothic Pro","メイリオ",Meiryo,"ＭＳ ゴシック";
  font-size: 15px;
  line-height: 1.6;
  letter-spacing: 0.1em;
  color: #333;
}
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  margin-bottom: 1rem;
}
h2,
h3 {
  letter-spacing: 0.1em;
}
#scrollToTop {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 100;
}
/* 矢印のスタイル */
#scrollToTop .arrow {
  display: none; /* テキストを非表示 */
}
#scrollToTop::after {
  content: '';
  display: block;
  position: absolute;
  top: 8px; /* ボタン内の中央に表示するため調整 */
  right: 0;
  bottom: 0;
  left: 0;
  margin: auto;
  width: 12px;
  height: 12px;
  border-top: 2px solid white;
  border-right: 2px solid white;
  transform: rotate(-45deg); /* 上向き矢印 */
}

@media (max-width: 640px) {
  body {
    font-size: 13px;
  }
}