body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

.container {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #333;
}

.pdf-viewer {
    width: 100%;
    height: 600px;
    border: none;
    border-radius: 4px;
    overflow: hidden;
}

.language-selector {
    margin-bottom: 20px;
    text-align: center;
}

.language-selector select {
    padding: 10px;
    font-size: 16px;
}