Fixing Spacer Element Display Issue on Published Page

Hello, I have the following problem. I copied a spacer element from the Style Guide into my page for a specific padding. However, on the published page, the spacer appears as a gray bar, even though it shouldn't have any height and also has no background color. So where does this gray bar come from, and how can I fix this problem? https://www.loom.com/share/f6216f19561b4a5bb66c735daa629232?sid=2b43f503-8435-4910-b9d4-385555d137fe