https://codepen.io/kesniet/full/KLPEEZ
Probably bad design-wise, but it was fun making it. I’ll accept feedback 
Like @Gunjan mentioned it looks like your colorful background doesn’t stretch to the whole page.
It makes the sound controls blend completely into the white background on smaller screens.
Good job though 
I thought I had it fixed, guess not. I’ll work on it some more, thanks.
Creative and fun. Love the colour blends