.audio-container {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 10px;
    background-color: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 5px;
    width: 100%;
    max-width: 500px;
}

#mp3Selector {
    padding: 5px;
    font-size: 16px;
    border-radius: 5px;
    border: 1px solid #ddd;
    flex-grow: 1;
    margin-right: 10px;
    width: 90%;
    box-sizing: border-box;
}

audio {
    width: 100%;
    min-width: 300px;
}

/* Responsive adjustments */
@media (min-width: 300px) {
    .audio-container {
        flex-direction: row;
        width: 100%;
    }

    #mp3Selector {
        margin-right: 10px;
        width: auto;
    }

    audio {
        width: auto;
        flex-grow: 1;
    }
}