Hello,
I can't find the custom lightning app in the classic view that I created in lightning.
In classic when I go to Apps I can't see the custom app that I created in lightning. I need to display the same logo in the classic view. 

As much as I put the header as blue


When the web page load, the header show black, why?


in this documentation https://help.salesforce.com/s/articleView?id=sf.snapins_chat_branding.htm&type=5 (https://help.salesforce.com/s/articleView?id=sf.snapins_chat_branding.htm&type=5) don't say anything about this... before talk with bot this header black is default?

I am new for this technologies so I want to know everything deep about these technoligies.
So Please, help me to learn this.