Make background style button functional

[MridulGupta007]

Subject of the issue

Describe your issue here.

Your environment

• version of angular-translate
• version of angular
• which browser and its version

Steps to reproduce

Tell us how to reproduce this issue. Please provide a working demo, you can use this template as a base.

Expected behaviour

Tell us what should happen Should change the background color

Actual behaviour

Tell us what happens instead No change in color

[developer-diganta]

Hi @MridulGupta007 ! Thanks for the issue. Can you tell if there are any specific websites for which this is not working?

[MridulGupta007]

Here the buttons provided aren't working

[developer-diganta]

I meant for which website is the extension not updating the background? Open any page like say wikipedia and then use this extension to check it. (You can find how to run this as an extension in the readme)