*{margin:0;padding:0;box-sizing:border-box}body{background-color:#f1f5f8;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;color:#333}.app{width:80%;background-color:#fff;margin:0 auto;height:100vh;padding:30px}header a{margin-left:20px;text-decoration:none;padding:5px 10px;background-color:#639;color:#fff;border-radius:3px;box-shadow:2px 2px #7e6e8f}h1{margin:20px 0}form{width:300px}label{display:block;text-transform:capitalize}input,button{padding:5px;margin-bottom:20px;width:100%;border-radius:3px}