.header_fix{position:fixed;z-index:112;top:-75px;left:0;width:100%;background: black;transition: all .5s;}
.top_0{top: 0px;transition: all .5s;}
.bg_fix{position: fixed;width: 100%;height: 100%;left: 0;top: 73px;}
.cp_fox{position: relative;z-index:1000000;}
.w_33{background: #fff;}