body{margin:0;padding:0;overflow:hidden;background-color:#fff}button{padding:5px 10px;background-color:#333;color:#fff;border:1px solid #666;border-radius:3px;cursor:pointer}button:hover{background-color:#444}#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}