Iknow current nav widget

On the site wpcalc.com uses the custom CSS.
Do you want to use the colors as on wpcalc.com?
The widget for navigation uses ‘Iknow Current Nav’

Yes i want to add the custom css in it
And i also i wanted to know how to add custom css in footer for background color?

Do you want to change the dark background in the footer?

No when i add widgets in the footer it display a gray background which doesn’t look nice so i want to add a custom colour in it

You can use the class footer for change style. like

.footer {
  background-color: #cccccc;
}

Ok Thanks ??