#app{font-family:Avenir,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;color:#2c3e50;background-color:#fff}.wrapper{display:flex;align-items:center;justify-content:center;height:100%}.block{width:120px;height:120px;background-color:#fff}#app,body,html{height:100%;margin:0;padding:0}