I did exactly this (but orange, not blue), so I can share a step-by-step 
example. 

I made a css file called theme_overrides.css. 

It contains this text: 

/* make table heads orange instead of pink */
th {
    background-color: #ffbf9c;
}

You only need to include formatting for the elements you want to change 
from the template's format. 

It is stored it in the source/_static directory of my project.

I use the html_context method to define it in conf.py: 

html_context = {
    'css_files': [
        '_static/theme_overrides.css', 
        ],
    }

This method is one of the methods described in the StackOverflow link. I'm 
not sure if it's always the best, but it works in my case. 

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