The width of the audio block is defined by the browser. You can override that via css.
The width of the accordion is already full width. The width of the article area is defined by your template and its css.
If you want to change that, use CSS or ask your template developer.
For more info about how elements get their styling, you can use the Element Inspector of your browser.
Hi Peter,
If you look at the screenshot (the second link), you’ll see that the first player, which is outside the accordion, looks fine and is also wider than the accordion itself. This suggests that the accordion is not taking up the full width of the article.