.cover-root{width:100vw;height:100vh}.wechat{background-image:url(../../assets/img/nvretool_bg_wx.png)}.download,.wechat{background-position:50%;background-repeat:no-repeat;background-attachment:fixed;background-size:cover}.download{background-image:url(../../assets/img/nvretool_bg.png)}.fix-button{margin:0 auto;position:fixed;left:60px;right:60px;bottom:60px}