body {
    font-family: Arial, sans-serif;
    background: #f5f5f5;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}
h1 {
    margin-top: 40px;
    color: #333;
}
#checkBtn {
    margin-top: 30px;
    padding: 10px 30px;
    font-size: 18px;
    background: #0078d7;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.2s;
}
#checkBtn:hover {
    background: #005fa3;
}
#result {
    margin-top: 30px;
    font-size: 20px;
    color: #0078d7;
}