Want to stack any Divi module side by side within a single column row?

CSS FOR COLUMN SETTINGS INSIDE THE ROW

display: flex;

align-items: center;

justify-content: center;

The above code should be placed inside the Main Element CSS Box in the Column Settings. To access column settings, first, go to the Row Settings, click on the settings gear to access the Column Settings, navigate to the Advanced tab, then to Custom CSS and add the code to the Main Element.

If you want to stack the modules in the mobile view, add the code below within the Column Settings on the mobile device type.

TO STACK BUTTONS ON MOBILE VIEW

display:block;