body,html{margin:0;padding:0;font-family:Arial,sans-serif;height:100%;display:flex;justify-content:center;align-items:center;background-color:#f0f0f0}.navbar{width:100%;background-color:#007bff;padding:10px 20px;position:fixed;top:0;left:0;display:flex;align-items:center}.navbar h1{color:#fff;margin:0;font-size:1.5em;width:100%;text-align:center}.App{text-align:center;background:#fff;padding:20px;border-radius:10px;box-shadow:0 4px 8px #0000001a}h1{color:#333;margin-bottom:20px}button{padding:10px 20px;margin:10px;border:none;border-radius:5px;cursor:pointer;background-color:#007bff;color:#fff;font-size:16px;transition:background-color .3s ease}button:hover{background-color:#0056b3}