#index{background:url(../img/0首页-1.a0a787d2.jpg) no-repeat 50%;background-size:100% 100%}#index .index_item{-ms-flex-preferred-size:28%;flex-basis:28%;cursor:pointer;height:calc(100vh - 165px);background-repeat:no-repeat;background-position:50%}#index .line{width:340px;height:340px;border-radius:50%;margin-bottom:18px}