Image sizes and number of columns of portfolio on other devices

Hello.
How can I set up image sizes and number of columns of portfolio on other devices. (tablet, mobile phone, smartphone)
Thx for answer.

Hello there,

You can use this CSS snippet. To apply extra custom CSS code to your site, put the code into the Additional CSS option which resides under Appearance > Customize in your site dashboard.

Regards,
Kharis