.difficulty-button, .home-button, .hint-button, .next-question, #pool-opciones button {
    padding: 10px 20px;
    margin: 10px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

.difficulty-button:hover, .home-button:hover, .hint-button:hover, #pool-opciones button:hover {
    background-color: #45a049;
}

#article-container {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background-color: #f9f9f9;
    border-radius: 5px;
    text-align: left;
}

#pool-opciones {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin: 20px 0;
}

#pool-opciones button.selected {
    background-color: #2196F3;
}

#hint-text, #explanation-text {
    padding: 15px;
    background-color: #e7f3fe;
    border-left: 6px solid #2196F3;
    margin: 10px 0;
    text-align: left;
}

#actions-container {
    text-align: center;
    margin: 20px;
}

#initial-selection, #game-content {
    text-align: center;
    padding: 20px;
}