Background color on Mobile

Hi. I would like to change the background color to black above and below the slider picture.

Hello, try to use the following CSS code.

You can add CSS code in Customize → Additional CSS section.

#slideshow.header-slider {
    background-color: rgb(0, 0, 0);

Please feel free to ask any other questions that you might have.

Kind Regards, Roman.
aThemes Support