Changing tracklist color

Hello,

I’m trying to change the color of the tracklist.

I succeeded changing the color of the track elements except the first one and the last one.

I’ve added:

.ttw-music-player .tracklist ol {
    background: #aaaaaa;
}

to style.css.

It makes the job except for the first track and the last track where the upper and lower border remain unchanged.

Here a link to the page:

https://www.onlinedu.ch/?page_id=49

Any clue how to correct this?

Thank you.

https://www.ads-software.com/plugins/html5-jquery-audio-player/