*{box-sizing:border-box}body{margin:0;font-family:sans-serif}.container{text-align:center;max-width:500px;margin:0 auto;padding:40px 20px}h1{margin-bottom:20px;font-size:32px}p{font-size:18px}button{cursor:pointer;border-radius:12px;margin-top:20px;padding:15px 40px;font-size:20px}.result{border:1px solid #ccc;border-radius:15px;margin-top:30px;padding:25px}@media (width<=600px){.container{padding:30px 15px}h1{font-size:26px}p{font-size:16px}button{width:100%;padding:15px;font-size:18px}.result{padding:20px}}