To temporarily fix this, go into your site's directory, and then into 0_site directory.
If it doesn't already exist, create a directory named "custom".
In that directory, if it doesn't already exist, create a file named inline.css
For example, the path would be
mysitename.example/0_site/custom/inline.css
In that file, add the following lines:
audio
{
width:20em !important;
height:4em !important;
}
This should fix things until I get a new release posted, which shouldn't be too much longer.
Thanks again for reporting this.