body{margin:0;padding:0;background:#f5f5f5}.bmi-container{max-width:300px;margin:50px auto;padding:20px;border:1px solid #ccc;border-radius:10px;text-align:center;font-family:Arial,sans-serif}.bmi-container input{margin:10px 0;padding:10px;width:100%;font-size:16px}.bmi-container button{padding:10px;width:100%;background-color:#000;color:red;border:none;font-size:16px;font-weight:bolder;cursor:pointer;margin-top:10px}.bmi-result{margin-top:20px}