Help with wavesurfer.js

I need to change the width and height not for the waveform only but for the whole player. The height is supposed to be changed by changing height in wavesurfer.js but nothing happen when I alter its value.

var WaveSurfer = {

defaultParams: { height : 128,

Can somebody help me?

 The player is on: 

https://conquerspanish.com/Accent-Reducer/AR-Lessons-I/L1-0001.html

 Thanks Arquimides