.activity{
  font-family: "Noto Serif JP", serif;
	font-optical-sizing: auto;
	font-weight: 400;
	font-style: normal;
	font-size:1.4em;
	text-align:center;
	line-height:1.1;
}

.introduce{

	position:relarive;
	margin:0 auto;
	margin-top:60px;
	width:60%;
	text-align:left;
}
@media screen and (max-width: 768px) {
.introduce {
	width:96%;
}}


.accordion {
  margin-inline: auto;
  margin-top: 30px;
  max-width: 90%;
  position: relative;
  width: 90%;
}
.accordion-title {
  color: #111;
  cursor: pointer;
  font-size: 1.0em;
  padding: 28px 20px;
}
.accordion-content {
  display: none;
  padding: 10px 20px;
}

.accordion-content img{
   width:40%;
   height:auto;
   -moz-border-radius: 10px;
   -webkit-border-radius: 10px;
   border-radius: 10px;
}
@media screen and (max-width: 768px) {
.accordion-content img{
   width:90%;
}}

.accordion-content p {
  font-size: .9em;
  line-height: 1.5;
}
/* タイトルの背景色 */
.accordion-item:nth-of-type(1) .accordion-title {
  background-color: #e1e0e0;
}
.accordion-item:nth-of-type(2) .accordion-title {
  background-color: #cecdcd;
}
.accordion-item:nth-of-type(3) .accordion-title {
  background-color: #bcbbbb;
}
/* コンテンツボックスの枠線 */
.accordion-item:nth-of-type(1) .accordion-content {
  border-bottom: 2px solid #ccc;
  border-left: 2px solid #ccc;
  border-right: 2px solid #ccc;
}
.accordion-item:nth-of-type(2) .accordion-content {
  border-bottom: 2px solid #ccc;
  border-left: 2px solid #ccc;
  border-right: 2px solid #ccc;
}
.accordion-item:nth-of-type(3) .accordion-content {
  border-bottom: 2px solid #ccc;
  border-left: 2px solid #ccc;
  border-right: 2px solid #ccc;
}
/* 矢印 */
.accordion-title {
  position: relative;
}
.accordion-title::after {
  border-right: solid 3px #333;
  border-top: solid 3px #333;
  content: "";
  display: block;
  height: 11px;
  position: absolute;
  right: 25px;
  top: 38%;
  transform: rotate(135deg);
  transition: transform .3s ease-in-out, top .3s ease-in-out;
  width: 11px;
}
.accordion-title.open::after {
  top: 45%;
  transform: rotate(-45deg);
}