The direct answer
Unexpected spacing, default margins or unmatched backgrounds can create a visible seam. The cause may be in the neighboring section rather than the dark one.
What to check
Inspect the boundary, wrappers and spacing at multiple widths. Check whether the band belongs to intentional content or an empty element.
What to do next
Correct the specific layout rule and preserve meaningful spacing. Retest adjacent sections so hiding one seam does not create a different overlap.
Further reading
Platform guidance can change. Consult the current official documentation before making platform-specific changes.
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