Meta Slider image size; need slider stretch; max-width: not working

Hello,
I am using the Free Meta Slider with Vantage.

I am trying to keep my Meta Image Slider (theme: Vantage(Flex)) to 1080 by 300 and need the slider to stretch across the entire page. I have tried adding the CSS:
body.responsive.layout-full #page-wrapper .metaslider .full-container,
.layout-full #page-wrapper .metaslider .full-container {
max-width: none;
}
but it does not do anything. All of my images are cropping unnecessarily making the images useless. Is there a way to define the cropping by percent or x,y instead of just the crop position drop-down? I have tried making my images large, small and the same size at the slider but none of this works. If I adjust the height of the slider, it does make some of my images work but I would prefer to keep the slider closer to 300 so my main content along with the slider can be viewed all at once on the homepage without having to scroll. Any suggestions?

Any help provided would be greatly appreciated.

Thank you.