What words make up the adverb phrase and which word does it modify in this sentence our money is kept in a giant safe

As in your last question, I defined an adverb phrase.
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So?
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In the sentence Our money is kept in a giant safe, the adverb phrase is in a giant safe. 
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I haven't reviewed this in a long time, but I think the word it modfies is giant.

This is what i found “an elliptical clause is a type of dependent, or subordinate, clause that is missing a word or words. often, the missing part is a verb or verb phrase. while elliptical clauses are acceptable to use, they can sometimes cause confusion for writers and readers, especially when the sentence ends with a pronoun.” i hope this you for what your looking for. can you plz mark me brainliest?