Okay, here is a basic HTML structure for a Super Mario themed page.

Okay, creating a full Super Mario game is very complex, but here is a very simple starting point for a basic platformer element using HTML, CSS, and JavaScript. This is not a complete game, just a small demonstration.

Okay, here's an update trying to make the visuals closer to the classic Mario style using CSS, without actual game sprites.

Okay, here's the code with basic collision detection for the top and bottom of blocks and background music playback initiated by the first key press.

(Note: I cannot provide actual audio files. You will need to replace "path/to/your/mario-music.mp3" with a real link or file path to your desired background music.)