It's not a css but javascript. You need to edit this file:
templates/gk_storefront/html/com_virtuemart/productdetails/default.php
and remove entire magic zoom functionality: See code below.
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// Magic zoom selectors
var main_image = false;
var main_image_thumbnail = false;
var product_details = false;
if(jQuery('.main-image').length > 0) {
main_image = jQuery('.main-image');
main_image_thumbnail = jQuery('.main-image > a');
product_details = jQuery('.productDetails');
}
if(jQuery('.hikashop_product_main_image_subdiv').length > 0) {
main_image = jQuery('.hikashop_product_main_image_subdiv');
main_image_thumbnail = jQuery('.hikashop_product_main_image_subdiv > a');
product_details = jQuery('.productDetails');
}
if(main_image.length > 0) {
// Add data-full-img update to the child images
if(jQuery(document).find('img.hikashop_child_image').length) {
jQuery(document).find('img.hikashop_child_image').each(function(i, img) {
jQuery(img).mouseover(function() {
jQuery('#hikashop_main_image').attr('data-full-img', jQuery(img).attr('data-full-img'));
});
});
}
var thumbnail = main_image_thumbnail;
var gkZoom = jQuery('<div/>', { id: 'gkZoom'});
var gkPreview = jQuery('<div/>', { id: 'gkPreview'});
gkPreview.css({'left': '-99999px'});
img_src = thumbnail.find('img').attr('src');
if(thumbnail.find('img').attr('data-full-img')) {
img_src = thumbnail.find('img').attr('data-full-img');
}
var gkPreviewSrc = jQuery('<img/>', { src: img_src });
if(jQuery('body').width() > jQuery('body').data('tablet-width')) {
var gkZoomWidth = parseInt(jQuery('body').data('zoom-size'), 10);
var gkZoomHeight = parseInt(jQuery('body').data('zoom-size'), 10);
} else {
var gkZoomWidth = thumbnail.width()/3;
var gkZoomHeight = thumbnail.width()/3;
var prevSize = product_details.width()/2-20;
gkPreview.css({'width': prevSize, 'height' : prevSize});
}
gkZoom.appendTo(thumbnail);
gkPreview.appendTo(jQuery('body'));
gkPreviewSrc.appendTo(gkPreview);
gkZoom = jQuery('#gkZoom');
gkZoom.css({'width': gkZoomWidth, 'height': gkZoomHeight});
var scale = gkPreview.width()/gkZoomWidth;
var offset = {};
var touch = {};
var thumb = {};
if(jQuery('body').width() > jQuery('body').data('tablet-width')) {
thumbnail.bind({
mouseenter: function(){
gkPreviewSrc.attr('src',thumbnail.find('img').attr('src'));
if(thumbnail.find('img').attr('data-full-img')) {
gkPreviewSrc.attr('src', thumbnail.find('img').attr('data-full-img'));
}
gkPreviewSrc.css({'width': scale*thumbnail.width(), 'height': scale*thumbnail.height()});
gkPreview.addClass('active');
gkZoom = jQuery('#gkZoom');
gkZoom.addClass('active');
gkPreview.css({'left': thumbnail.offset().left+thumbnail.width()+20, 'top': thumbnail.offset().top});
},
mousemove: function(e){
//
offset.x = (e.pageX - jQuery(this).offset().left)-gkZoomWidth/2;
offset.y = (e.pageY - jQuery(this).offset().top)-gkZoomHeight/2;
// validation
if(offset.x < 0) offset.x = 0;
if(offset.y < 0) offset.y = 0;
if(offset.x > thumbnail.width()-gkZoomWidth) offset.x = thumbnail.width()-gkZoomWidth;
if(offset.y > thumbnail.height()-gkZoomHeight) offset.y = thumbnail.height()-gkZoomHeight-3;
gkZoom.css({'left' : offset.x, 'top' : offset.y});
offset.bx = offset.x*scale;
offset.by = offset.y*scale+6;
// validation
if(offset.bx < 0) { offset.bx = 0; }
if(offset.by < 0) { offset.by = 0; }
if(offset.bx > gkPreviewSrc.width()-gkZoomWidth*scale+12*scale) offset.bx = gkPreviewSrc.width()-gkPreview.width();
if(offset.by > gkPreviewSrc.height()-gkZoomHeight*scale+12*scale) offset.by = gkPreviewSrc.height()-gkPreview.height();
gkPreviewSrc.css({'right': offset.bx, 'bottom' : offset.by});
},
mouseleave: function() {
gkPreview.removeClass('active');
gkZoom.removeClass('active');
}
});
} else if(jQuery('body').data('tablet-width') > jQuery('body').width() && jQuery('body').width() > jQuery('body').data('mobile-width')) {
thumbnail.bind('touchstart', function(e) {
e.preventDefault();
e.stopPropagation();
gkPreviewSrc.attr('src', thumbnail.find('img').attr('src'));
if(thumbnail.find('img').attr('data-full-img')) {
gkPreviewSrc.attr('src', thumbnail.find('img').attr('data-full-img'));
}
var scale = gkPreview.width()/gkZoomWidth;
gkPreviewSrc.css({'width': scale*thumbnail.width(), 'height': scale*thumbnail.height()});
gkPreview.addClass('active');
gkPreview.css({'left': thumbnail.offset().left+thumbnail.width()+20, 'top': thumbnail.offset().top});
gkZoom.addClass('active');
});
thumbnail.bind('touchmove', function(e) {
thumb.x = thumbnail.offset().left;
thumb.y = thumbnail.offset().top;
var touches = e.originalEvent.changedTouches || e.originalEvent.touches;
touch.x = touches[0].pageX;
touch.y = touches[0].pageY;
//
if(touch.x > thumb.x && touch.x < thumb.x+thumbnail.width() && touch.y > thumb.y && touch.y < thumb.y+thumbnail.height()) {
e.preventDefault();
offset.x = (touch.x - thumb.x)-gkZoomWidth/2;
offset.y = (touch.y - thumb.y)-gkZoomHeight/2;
// validation
if(offset.x < 0) offset.x = 0;
if(offset.y < 0) offset.y = 0;
if(offset.x > thumbnail.width()-gkZoomWidth) offset.x = thumbnail.width()-gkZoomWidth+12;
if(offset.y > thumbnail.height()-gkZoomHeight) offset.y = thumbnail.height()-gkZoomHeight+12;
gkZoom.css({'left' : offset.x, 'top' : offset.y});
offset.bx = offset.x*scale+6;
offset.by = offset.y*scale+6;
// validation
if(offset.bx < 0) { offset.bx = 0; }
if(offset.by < 0) { offset.by = 0; }
if(offset.bx > gkPreviewSrc.width()-gkZoomWidth*scale+12*scale) offset.bx = gkPreviewSrc.width()-gkPreview.widht();
if(offset.by > gkPreviewSrc.height()-gkZoomHeight*scale+12*scale) offset.by = gkPreviewSrc.height()-gkPreview.height();
gkPreviewSrc.css({'right': offset.bx, 'bottom' : offset.by});
}
});
thumbnail.bind('touchend', function(e) {
gkPreview.removeClass('active');
gkZoom.removeClass('active');
});
}
}
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(be careful not to delete too much).