Use images for Variable products and linked variations

Hi team,

Could you provide css code to increase the image size for Variable products and linked variations, keep same ratio as thumb picture instead of square, our products are 5:7 ratio.
The theme default image size is too small, and not our ratio type picture, so we need to change.

2. We found the selected option name is only display to variable products, could you also enable displaying name for linked variations products.

Thank you for your help.