#about .d_flex {
    display: flex;
}

#about .left_area {
    display: flex;
    flex-direction: column;
}

#about .w_40 {
    width: 40%;
}

#about .w_60 {
    width: 60%;
}

#about .text_box {
    flex: 1;
}

#about .image_box {
    flex: 1;
}

#about .center {
    text-align: center;
}



.scroll-wrapper {
  position: relative;
  width: 100%;
  height: 400px;
  overflow: hidden;
  color: white;
  display: flex;
}


.scroll-wrapper:after {
    content: "";
    display: block;
    width: 100%;
    height: 200px;
    position: absolute;
    bottom: 0;
    left: 0;
    background: linear-gradient(to bottom, rgba(9, 7, 7, 0) 0%, rgba(9, 7, 7, 0.5) 31%, rgba(9, 7, 7, 1) 100%);
    z-index: 3;
}

/* スクロールバーの表示領域（左側） */
.custom-scrollbar {
  width: 6px;
  height: 100%;
  background: transparent;
  background-repeat: no-repeat;
  background-size: 1px 100%;
  position: relative;
  margin-right: 6px;
}

.custom-scrollbar::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  width: 1px;
  height: 100%;
  background: white;
  transform: translateX(-50%);
  z-index: 0;
}

/* スクロールバーのつまみ */
.custom-scrollbar .thumb {
  width: 100%;
  background: white;
  border-radius: 10px;
  position: absolute;
  top: 0;
  height: 50px;
}

/* スクロールするコンテンツ */
.scroll-content {
  height: 100%;
  overflow-y: scroll;
  flex: 1;
  padding-left: 4em;
	padding-bottom:200px;
	position:relative;
}


.scroll-content::-webkit-scrollbar {
  display: none; /* ネイティブのスクロールバー非表示 */
}


.floor-tabs .tab-content{
	text-align:left;
}

.floor-tabs .tab-content li{
	margin-bottom:1em;
	line-height:3em;
}

.floor-tabs .tab-content ol {
  list-style-type: decimal; /* 1. 2. 3. */
  padding-left: 1.5em;
	margin-bottom:3em;
	padding-left:2em;
}

.floor-tabs .tab-content ol ol {
  list-style-type: lower-alpha; /* 一、二、三 */
}

.floor-tabs .tab-content ol ol ol {
  list-style-type: katakana-iroha; /* イ、ロ、ハ、ニ... */
}

.rule_cont h3{
	font-size:1.2em;
	margin-bottom:2em;
}

.rule_cont h4{
	margin-bottom:2em;
}

.rule_cont p{
	margin-bottom:2em;
}

.rule_cont table{
	line-height:3em;
	margin-bottom:3em;
}

.rule_cont table th,
.rule_cont table td{
	padding:0 1em;
}

.rule_cont table th{
	background-color:#555;
}