body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
}

header {
    background-color: #3498db;
    color: white;
    padding: 20px;
    text-align: center;
}

h1 {
    font-size: 2.5em;
}

.cta-button {
    color: white;
    background-color: #2c3e50;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
}

.cta-button:hover {
    background-color: #34495e;
}

footer {
    text-align: center;
    padding: 10px;
    background-color: #2c3e50;
    color: white;
}

form {
    display: flex;
    flex-direction: column;
    margin: 20px auto;
    width: 80%;
    max-width: 400px;
    background-color: white;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
}

select, button {
    margin-bottom: 15px;
    padding: 10px;
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background-color: #2980b9;
}

#flashcards-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin: 20px;
}