There are currently three themes available for the embeddable player.
The minimal player features a basic play/pause control, with a clean UI and plenty of metadata. The background of the player fills up as the episode plays, showing the current position. The minimal theme does not feature the ability to seek. It is the default player theme.
The thick player has a seek bar and controls to skip forward and back. It shows the episode artwork, if available, and shows the podcast cover art if it is not. The thick player's background is a stylized version of the artwork.
The slim player contains no metadata. It has a seek bar and basic controls. The slim player is designed to blend in on sites that have their own themes, and where the audio player should not draw the eye.