revolution slider

hello,
m using revolution slider, and having one logo img whose width is 120 and height is 120 it looks good on desktop but when i’m testing on mobile the logo image and the text on the slider is displaying on center of the slider and it seen very small and not able to even read it, how to set the min width of that image bcoz m not able to find the min width for image , how to resolve this ???
i’m sending u the screenshots of desktop version and mobile version so it will be understandable for u.
Pls help me as its really important , hope to hear soon from you