body{background-image:url(../img/2022nacnpc.png);background-repeat: no-repeat;background-position: top center;}
.top{width:100%;}
.top a{display:block;width:990px;margin:0 auto;height:80px;text-indent:-9999;}
.pc{/*background-color:#fff;*/width:990px;margin:0 auto;padding:0px 20px;}
@media screen and (max-width: 767px) {
  body{background-image:none;padding:0;}
  .top{display:none;}
  .banner,.banner img{width:100%;}
}