You may wish to change the footer bar color, font family and size, font-weight, etc. Here's how to do it using css code.

Appearance>Customize>Additional CSS and insert the following code:
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.site-info {
text-align: center;
font-family: arial;
font-size: 20px;
font-weight: 600;
font-stretch: ultra-condensed;
color: #ffffff;
background-color: #352ece;
line-height: 0px;
}
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Now you can change the css attributes to whatever footer bar color, font family, font size, etc you wish. If you want to use the font-stretch attribute, make sure the font family has a condensed version. Dispense with any of the code not required before clicking on Publish.