Icon backgrounds

Hello again,

Yes, it is possible and we have added that option in one of recent plugin updates. Regarding icon background color, you are defiantly right. Background color change won’t stack, so this is defiantly small bug, and thank you for noticing this. We have already fixed that, but we are working on something else so expect an update in few days max. Until then in order to overcome this you can apply custom css code below from child theme style.css or with some plugin, like for example this one https://wordpress.org/plugins/simple-custom-css/ and change color value to your liking:

.rolo_slider .slider-arrow:hover {
    background-color: rgba(200,200,200, 0.5);
}

Also, you may find following tool helpful http://hex2rgba.devoth.com/ in order to easier convert desired hex color to RGBA one.

All the Best!