Galleria Slideshow Site (reactJS and scss)

Hi there ! Just finished this project, but i got questions about some details :

• How can i set the masonry layout perfectly like in the figma file ?
• I can't make "box-shadow" appear on the bottom of my cards. I've already read about position absolute issue, z-index, etc, but still have problems.

Thx in advance, and have a nice journey on Frontendmentors !