body {
    margin: 0;
    font-family: Arial, sans-serif;
    background:url(back.png);
    background-size:cover;
    background-attachment:fixed;
    color: #ffffff;
}


header {
    background: #333;
    color: white;
    padding: 15px;
    text-align: center;
}


.view {
    padding: 20px;
}

.hidden {
    display: none;
}


.topic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}


.topic-card {
    background: rgb(102, 126, 207);
    padding: 15px;
    border-radius: 6px;
    border: 1px solid #ddd;
    cursor: pointer;
}

.topic-card:hover {
    background: #17212b;
}


.question-item {
    background: rgb(80, 107, 129);
    padding: 10px;
    margin: 10px 0;
    border-left: 4px solid #007bff;
    border-radius: 5px;
}


button {
    background: #3f6c9c;
    color: rgb(185, 223, 255);
    border: none;
    padding: 8px 12px;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background: #3893f4;
}

.code-box {
    background: #413333;
    padding: 10px;
    border-radius: 5px;
    font-family: monospace;
    overflow-x: auto;
}


.output-box {
    background: #b49e9e;
    padding: 10px;
    margin-top: 10px;
    border-radius: 5px;
}