body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif;
     background: url('challange.jpg') no-repeat center center fixed;
}

.quiz-box {
    background: rgba(255, 255, 255, 0.8);
    padding: 30px 40px;
    border-radius: 15px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
    text-align: center;
    max-width: 400px;
    width: 90%;
}

h2 {
    margin-top: 0;
    color: #2d3436;
}

.flash-numbers {
    font-size: 2em;
    font-weight: bold;
    color: #d63031;
    margin: 20px 0;
}

input[type="text"] {
    padding: 12px;
    font-size: 1.2em;
    border-radius: 8px;
    border: 1px solid #ccc;
    width: 100%;
    margin-bottom: 15px;
    text-align: center;
    letter-spacing: 5px;
}

button {
    padding: 15px 25px;
    font-size: 1.1em;
    border: none;
    border-radius: 8px;
    background: #0984e3;
    color: white;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background: #0652dd;
}

.message {
    margin-top: 15px;
}

.success {
    color: green;
    font-weight: bold;
}

.error {
    color: red;
    font-weight: bold;
}
a button {
    margin-top: 10px;
    display: inline-block;
}