Fullwidth Easy Slider Images on Mobile

I have been having some problems with the height of the Fullwidth Easy Slider on mobile devices. When it gets to a certain height there is no room for the text in the caption. I need to display the text on all sizes/devices, so hiding it isn’t an option. I have made the height of the slider bigger using this code:

	#full_slider_1 .avia-slideshow-inner, #full_slider_1 {
        height: 400px !important;
    }

However the images that are set for the three slides don’t scale to fill the area and there is a big white space under them. I set a new background image to appear under the text and I would like to use it in place of the images in the slider. Can someone tell me how to hide them? I can’t find where they are referenced in the CSS. If I can hide those, then I should be able to position the new background image so it will work as a replacement. The home page on the website linked in the private info is where I am having this issue. If you view the page around 736px wide you will see the new background image I placed under the text.

Any help would be great. This is somewhat of a pressing issue.