2 How to change blogger Header background color

A vast majority of bloggers like unique template different from, and distinquishing their blog from other blogs. Many too likes fancy graphics. I on the other hand prefer simple template with no graphics and I use the no frills Blogger standard Minima template as this is a blog which soughts to provide useful information and simple easy to understand instructions. So far, the only substantial customization is to convert the standard 2 column Minima template to 4 column Minima template. Today, I went a teeny weeny step more by changing the Header background color to #5588AA; which is the same blue color for the hyperlinks. All I need...