Perlin noise // changing background

hi i am trying to change the background on this fiddle of a perlin noise object.

i added this line: scene.background = new THREE.Color( 0x22f9f9 );

but nothing has changed.

strange, it does work, but not in jsfiddle

It works with the latest version (R96) of three.js:

You have included R75. Scene.background was added wit R78.

Possible solution with the solid colour of the scene background can be using of
renderer.setClearColor( 0x22f9f9 );