body *{box-sizing:border-box}body{font-family:PingFangSC-Regular,Roboto,Helvetica Neue,Helvetica,Tahoma,Arial,PingFang SC-Light,Microsoft YaHei}button{margin:0;padding:0;border:1px solid transparent;outline:none;background-color:transparent}button:active{opacity:.6}.flex-col{display:flex;flex-direction:column}.flex-row{display:flex;flex-direction:row}