It is going to be hidden within the CSS but you can override that with some custom CSS.
likely one of these to play with but i am not sure sure in your environment:
.Skin #Buttons{max-width:200px;margin:0 auto;padding:40px 0;margin-top:-15px;overflow:hidden}
.Skin #Buttons #NextButton,.Skin #Buttons #PreviousButton{-webkit-border-radius:4px;-moz-border-radius:4px;-ms-border-radius:4px;-o-border-radius:4px;border-radius:4px;font-size:10px;background:#319dab;width:100px;font-size:24px;font-weight:400;min-height:50px;padding:10px 20px}
@media (max-width:100px){
.Skin #Buttons #NextButton, .Skin #Buttons #PreviousButton{width:25%}
}

@altatunc THANK YOU SO MUCH!!! I used
.Skin #Buttons #NextButton,.Skin #Buttons #PreviousButton{-webkit-border-radius:4px;-moz-border-radius:4px;-ms-border-radius:4px;-o-border-radius:4px;border-radius:4px;font-size:10px;background:#319dab;width:100px;font-size:24px;font-weight:400;min-height:50px;padding:10px 20px}
and adjusted some numbers, all came out perfect!!