body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #5283db, #2a987a);
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    text-align: center;
}

.container {
    max-width: 800px;
    padding: 20px;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.themes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.theme-card {
    background: #ffffff;
    color: #333;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

.theme-card:hover {
    transform: translateY(-5px);
}

.theme-title {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 10px;
}

.theme-source {
    font-size: 0.9rem;
    color: #666;
}