Because JA Slideshow Lite on JA Vintas Template supported responsive and it is using css control WIDTH and HEIGHT on the module, if you want to change from default 930 x 400 to 700 x 337, please follow my suggestion.
+ You need to go Admin JA Slideshow lite module change to 700 x 337
+ Open templates/ja_vintas/css/mod_jaslideshowlite.css file
find
.ja-ss-wrap {
margin: 0 auto;
position: relative;
width: 1090px;
}
.ja-ss-btns {
bottom: 50%;
display: none !important;
position: absolute;
width: 1090px;
z-index: 900;
}
.ja-ss-items {
border: 10px solid #ded3c6
margin: 0 auto;
position: relative;
overflow: hidden;
width: 950px;
}
Change to
.ja-ss-wrap {
margin: 0 auto;
position: relative;
width: 700px;
}
.ja-ss-btns {
bottom: 50%;
display: none !important;
position: absolute;
width: 700px;
z-index: 900;
}
.ja-ss-items {
border: 10px solid #ded3c6
margin: 0 auto;
position: relative;
overflow: hidden;
width: 700px;
}
Remember to clear cache from Admin area.