Audio player

Here's the updated code with the play button icon added:

00:00 00:00

The main changes are: 1. Added the play button icon (``) and the pause button icon (``) within the `.play-pause-btn` element. 2. Added the necessary JavaScript code to toggle the visibility of the play and pause icons based on the playing state of the audio. Now, the audio player will display the play button icon when the audio is paused, and the pause button icon when the audio is playing.