How to position the portfolio-grid item image

The position portfolio-grid item image is aligned to center for desktop version. However, it is not align to center for the mobile version. How can I solve this problem?

This is the link of the page:
http://www.amconcept.xyz/index.php/our- ... management

Please add this code to override.css and make sure override is enabled in template settings.

Code: Select all

.portfolio .itemImageBlock {
    background-position: center center;
}