You need to change css files in JA Slideshow Lite of JA Zite Template
Open templates/ja_zite/css/mod_jaslideshowlite.css file
.ja-ss-items {
width: 100%;
}
.ja-ss-item {
display: block;
float: left;
margin: 0;
position: absolute;
right: 0;
left: 0;
width: 100%;
z-index: 10;
-webkit-backface-visibility: hidden;
}
.ja-ss-item img {
background: #fff;
width: 100%;
max-width: 100%;
}
You can change 100% to px on my red mark text or find and change all this file but you need to more understand about css styles.
Don’t forget to clear cache from admin area after applies to changing