How to add header menu background before scroll in ShopIsle

If you want to add background to the menu before scroll then, you need to install the plugin  Advanced CSS Editor and in Appearance -> Customize -> Advanced CSS Editor add the following code:

body.home .navbar-transparent {
background:#000 !important;
}

You can change the color code to what color you want, you could use a website such as this one to find a color: http://www.hexcolortool.com/