#app{font-family:Avenir,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-align:center;color:#2c3e50;margin-top:60px}.head{height:100px;top:0;border-bottom:1px solid}.foot,.head{position:fixed;width:100%;z-index:9999;border-top:1px solid;background-color:#fff}.foot{height:40px;margin-top:50px;bottom:0}.showFile{width:100%;height:30%;padding-top:60px;padding-bottom:20px}