How to start, pause and stop the dash app like the dash sample apps

I am trying to implement a start, pause and stop button just like this one: https://dash-gallery.plotly.host/dash-daq-pressure-gauge-kjl/

I need two buttons, one at the MGC 4000. such that when clicked, make the screen a little blur and the start and stop button below.

Please can anyone guide through? I am looking for the feature.