Change social icons background color in Llorix One very top header

In case you don't have a CSS plugin, we advise you install Advanced CSS Editor plugin and follow the instructions, pasting the code in Appearance -> Customize -> Advanced CSS Editor.

If you're using WP 4.3+ then you could go to Appearance->Customize->Additional CSS and add the code below.

.very-top-header .transparent-text-dark{
background: #3c763d;
}

To change the background color on hover:

.very-top-header .transparent-text-dark:hover{
background: #f16c20;
}

You could find the HEX color code for the color of your choice from this website: http://www.hexcolortool.com/