how to code Second header (small type above in the main header)

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Good day! 

I have a problem and I want to execute a second header for my theme.liquid. I don't know on how to code it or put some logical pattern to make a second header. 

I hope someone can help me with this issue. 

Sample image of the what I want to achieve is attached below. By the way I am using Brooklyn Theme.The black one (second header)The black one (second header)