.a_body{ overflow-x: inherit;}
header{position: sticky; top: 0;}
.link_hd{ margin-bottom:1rem;}
.link_hd ul{ display:flex;}
.link_hd li{ width: 6.25rem; height:2.25rem; margin-right：1rem; display: flex !important; align-items: center; justify-content: center; position: relative; z-index: 1; font-size: .8125rem; color: #666666; transition: .5s;}
.link_hd li:before{ content: ""; box-sizing: border-box; display: block; width: 100%; height: 100%; position: absolute; left: 0; top: 0; border-radius: 1.25rem; border: 1px solid #bebfc0; z-index: -2; transition: .5s;}
.link_hd li:after{ content: ""; display: block; box-sizing: border-box; width: 100%; height: 100%; position: absolute; left: 0; top: 0; border-radius: 1.25rem; z-index: -1; transition: .5s; background:#d4042c; opacity: 0; visibility: hidden; }
.link_hd li:hover:before,.link_hd li.on:before{ opacity: 0; visibility: hidden; }
.link_hd li:hover:after,.link_hd li.on:after{ opacity: 1; visibility: visible; }
.link_hd li:hover,.link_hd li.on{ color: #fff !important;}