Scale the contents so that ControlSlider can be used with default scaling. See #90.
Dynamically expand the width of the track and accordion box. See https://github.com/phetsims/fluid-pressure-and-flow/issues/248
Center the content.
Use the default scaling for ControlSliders. See #90.
Updated documentation related to UnderPressureModel.currentVolume and PoolWithFaucetsModel.volume properties. See #105