Twentyfifteen Customization CSS for a Business Site

Just customized twentyfifteen for a business site. Here is the customization CSS:

And the result is:

I used Background Manager to add background slideshow.

Other useful plugins:

• WP Add Custom CSS (see a review here)
• SiteOrigin Widgets Bundle
• Page Builder by SiteOrigin
• Meta Slider
• Limit Login Attempts
• Easy Google Fonts