Divi Toolbox ➜ Modules ➜ Global CSS Classes
Divi Toolbox adds CSS snippets which will allow you to easily modify some elements. These custom CSS classes can be added to any element (section, row, column, or module) – if a class is specific to an element it will be noted in the class description.
Add this class to a Column to vertically center modules inside that column (the “Equal Column Heights” option needs to be enabled in that Row).
Add this class to any element to change it’s height to 100% of viewport height.