#app{font-family:Avenir,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-align:center;color:#2c3e50}body{background-image:radial-gradient(circle,#323232,#1e1e1e)}.center{display:flex;justify-content:center;align-items:center;color:#fff;font-size:16px;height:200px;width:400px;position:fixed;top:50%;left:50%;margin-top:-100px;margin-left:-200px}