The Spinning Cube Challenge

You are a hacker who has stumbled upon a secret website challenging readers to decode a series of HTML and CSS instructions to reveal a hidden message. However, this task isn't as simple as it seems. The clues are presented as spinning cubes, and you must use your spatial reasoning skills to decipher each step and progress to the next level. Each level increases in difficulty and introduces new challenges, including additional spinning cubes, changing colors, and invisible elements.