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}.App{text-align:center;font-size:200px}.center{display:flex;justify-content:center;align-items:center;height:100vh;flex-direction:column}.timer{font-size:140px;padding:2%}button{font-size:50px;margin:20px;padding:20px;border-radius:10px;border:none}.button-start{background-color:#4caf50;color:#fff}.button-reset{background-color:#f44336;color:#fff}