I am trying to use clustergrammer inside an electron app but I am getting Uncaught TypeError: Cannot read property 'getComputedStyle' of null (See screenshot below)

I've followed the instructions from the official page which describes how to use clustergrammer in a web page.
My package.json looks like below,

To reproduce this issue I've created a minimal repo in GitHub. First, execute yarn install inside the repo folder to install the node modules and then execute yarn start to launch the app.
My OS is Ubuntu 20.04 and using node version 14.16.1
Is it a bug or I am missing something? I will appreciate your suggestions
I am trying to use clustergrammer inside an electron app but I am getting
Uncaught TypeError: Cannot read property 'getComputedStyle' of null(See screenshot below)I've followed the instructions from the official page which describes how to use clustergrammer in a web page.
My package.json looks like below,
To reproduce this issue I've created a minimal repo in GitHub. First, execute
yarn installinside the repo folder to install the node modules and then executeyarn startto launch the app.My OS is Ubuntu 20.04 and using node version 14.16.1
Is it a bug or I am missing something? I will appreciate your suggestions