Hi ibrahim sab,
For mendix 9 you can directly use custome css inside the themesource/{Your module name}/web/main.scss
Thanks,
Javith
Hi Ibrahim, what version of Mendix are you using? Mendix 9 no longer uses Calypso.
How did this happen? This folder is created automatically when the project is initiated. If you need the whole folder structure back you can try to create a new project and copy paste the folder from there.
is the project you experienced this a new project or has there been some changes in the styling before which are now lost? Maybe you can roll back to a revision where this folder still existed?
You best read up on styling for Mendix 9: https://docs.mendix.com/howto/front-end/customize-styling-new/. Great that it is now integrated into StudioPro.