.foot{position:fixed;bottom:4vh;width:4.906667rem;color:rgba(0,0,0,.45);font-size:.186667rem}.foot .help{margin:0 auto;margin-bottom:1vh;width:60%}.foot .help .item{color:rgba(0,0,0,.45)}.foot .help :hover{color:rgba(0,0,0,.65)}