#app{font-family:PingFang SC,Helvetica Neue,Helvetica,Microsoft YaHei,微软雅黑,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;color:#333;max-width:750px;margin:0 auto;background-color:#fff;min-height:100vh;box-sizing:border-box;padding:15px;font-size:14px;line-height:1.5}*{margin:0;padding:0}body{background-color:#f5f5f5}