.head{width:100%;height:40px;background:#292929}.head:hover{background:#292929e6}.head{padding:40px;display:flex;flex-direction:row;justify-content:space-between;align-items:center;border:transparent;cursor:pointer}@media(min-width:1024px){.head{margin:0 auto;width:1024px}}.tail{width:100%}@media(min-width:1024px){.tail{margin:0 auto;width:1024px}}.tail{height:auto;background:#dedede}.plus-1,.plus-2{transition:all .3s;background:#fff;height:2px;width:40px}.plus-2{transform:translateY(-2px) rotate(90deg)}.open-15{transition:all .3s;transform:rotate(45deg)}.port43{margin-top:3px}.port21{padding-bottom:600px}