body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: #f0f0f0;
}

.controls {
    margin-bottom: 8px;
    display: flex;
    gap: 10px;
}

button {
    padding: 4px 8px;
    font-size: 16px;
    cursor: pointer;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: white;
    transition: all 250ms ease;
}

.lang-btn.active {
    background-color: #007bff; /* Example active color */
    color: white;
    border-color: #007bff;
}

button:hover {
    background: grey;
    color: white;
}

iframe {
    width: 1180px;
    height: 820px;
    border: 1px solid #ccc;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}