Hello,
Thanks for using our theme.
Add the next code in Theme Options > Theme Custom CSS:
.products-grid .product-title {
font-size: 24px;
}
.products-grid .product-excerpt {
font-size: 16px;
line-height: 26px;
}
.products-grid .price {
font-size: 20px;
}
.products-grid .add_to_cart_button {
font-size: 18px;
}
Regards