*{
  margin: 0;
  padding: 0;
}
html,body{
  height: 100%;
}
body{
  border: 0 none;
}
.product_introduction_list{
  margin-top: 72px;
  margin-bottom: 72px;
}
.product_introduction_list .end{
  text-align: center;
}
.product_introduction_list .end img{
  width: 130px;
}
.product_introduction_list .content{
  display: flex;
  flex-wrap: wrap;
}
.product_introduction_list .content a{
  width: 50%;
}
.product_introduction_list .content img{
  width: 100%;
}
.product_introduction{
  overflow: hidden;
  height: 100%;
}
.product_introduction .container{
  height: calc(100% - 122px);
  overflow: auto;
  margin-top: 122px;
}
.product_introduction .content img{
  width: 100%;
  vertical-align: middle;
}
.product_introduction .nav-menu{
  position: fixed;
  z-index: 100;
  top: 72px;
}
.product_introduction .nav-menu .nav{
  height: 50px;
  line-height: 50px;
  text-align: center;
}


.not_notice{
  height: 42px;
}

.pages_notNotice .product_introduction .nav-menu{
  top: 42px;
}

.pages_notNotice .product_introduction .container{
  height: calc(100% - 92px);
  margin-top: 92px;
}