body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}.toolbar{position:fixed;top:0;left:0;width:100%;background-color:#333;color:#fff;padding:10px 0;text-align:center;transition:top .3s}.toolbar:hover{top:-50px}.App{height:100vh}