How to add a Brand theme in courier Component

I design a Brand via UI by the Guidance of below Link

how can i change these Brand Design in Embedded design.

In My Case,

I try to use Embedded Integration. I applied the theme same as someone answered in the Community Answers.

But the Bell Icon and Themes are loaded in the Default Brand i configured in the Courier Ui -->Channels–> Courier Push → Client key Page.

but How to use the designed Brand in Angular Application.

And how to change bell Icon Color and tabs–> All Messages tab action button colors. these are now loading with the default brand.