Hi csoweb
You can try with this custom CSS:
.portfolio.blog-grid > .itemList[data-cols="2"] > article, .portfolio.blog-grid > .itemList[data-cols="3"] > article, .portfolio.blog-grid > .itemList[data-cols="4"] > article, .portfolio.blog-grid > .itemList[data-cols="5"] > article, .portfolio.blog-grid > .itemList[data-cols="6"] > article, .portfolio.portfolio-grid > .itemList[data-cols="2"] > article, .portfolio.portfolio-grid > .itemList[data-cols="3"] > article, .portfolio.portfolio-grid > .itemList[data-cols="4"] > article, .portfolio.portfolio-grid > .itemList[data-cols="5"] > article, .portfolio.portfolio-grid > .itemList[data-cols="6"] > article {
padding: 25px !important;
}
add to custom field code or 'override.css' file as suggested here