Hi nsca,
We use the style3 class to display the shadow effect of images on both Article, Blog layout and Slideshow module. In order to change each section image separately by try to put below codes into the of templates/ja_bistro/css/template.css file:
/*Blog layout*/
.blog .img-style-wrap.style3 img {
border: 1px solid #e8e8e8;
padding: 4px;
}
/*Article view*/
.item-page .img-style-wrap.style3 img {
border: 1px solid #e8e8e8;
padding: 4px;
}
/*Slideshow*/
.ja-slide-item .img-style-wrap.style3.left {
border: 1px solid #e8e8e8;
padding: 4px;
}
Change to the border and padding values you want, then clear JAT3 cache.