Spacing issues between the two objects

Hi hope everyones well,

Im a noob who is making his portfolio website, I want the dark grey boards to be right next to each other vertically when scrolling but it leaves a huge white gap between them when scrolling, any solutions?

Thank you

Here is my site Read-Only: [LINK][1]

Hi @Mo_Rezaei , your read-only link is leading to a 404 - do you have an updated link you can share?