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If you are talking about the navigation pagers for smartphone, please visit How to make the navigation pagers larger in mobile devices
You can use media query in your ninja-slider.css file to make a separate copy for the navigation control styles (suppose you have a larger navs-for-mobile.png image):
@media only screen and (max-width: 533px)
{
#ninja-slider-prev, #ninja-slider-next
{
width:100px;
height:100px;
background-image: url(img/navs-for-mobile.png);
}
#ninja-slider-prev:hover {background-position:0 -100px;}
#ninja-slider-next {
right: 0;
background-position:-100px 0;
}
#ninja-slider-next:hover {background-position:-100px -100px;}
}