Meta Slider Theme Image Size Issue

I am using Vantage with the meta slider. The cropping of the images keeps coming up incorrect. I uploaded images the exact size of the slider and disabled cropping and it doesn’t display properly. As I adjust the size of the window it somewhat adjusts the size of the image in the slider. I have found through other threads to add custom CSS which I did and it does not seem to help. Any other information or recommendation will be greatly appreciated.