Hi there,
each page has a unique ID that is displayed as a body class.
Find the ID of the page, by checking its URL in the editor.
Then you can add it to your CSS selector like so:
.page-id-44 .gb-grid-wrapper > .gb-grid-column > .gb-container {
Alternatively and more flexible method you can do this:
1. Select the Parent Grid(s) you want to apply the shadow to. Make sure you select the parent:
https://docs.generateblocks.com/article/grid-overview/#editing-our-grid-block
2. Once selected go to Settings sidebar > Advanced and add a Additional CSS class of: shadows
3. Then use this CSS selector:
.gb-grid-wrapper.shadows > .gb-grid-column > .gb-container {
This method i prefer as you can set it selectively