How to Make Your Popup Responsive with Custom Dimensions

To make your popup responsive you should do the following:

Select the "Custom mode" in the Dimensions section of your popup settings.

Set "Width" and "Height" in pixels (px) and "Max width" and "Max height" in percentages (%).

When the screen is too wide, "Max width" option will work and it will prevent showing a too large popup.

Width: 640px

Height: 480px

Max width: 80%

Max height: 90%

Min width: 300 (px)

Min height: 100 (px)