Fix dark body background

[vbaranov]

Caused by the implementation of #3333

Motivation

Eliminate permanent all pages' dark body background together with eliminating of flickering at transactions page of Dark forest contract

Checklist for your Pull Request (PR)

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so by submitting a PR to https://github.com/blockscout/docs
• If I added/changed/removed ENV var, I submitted a PR to https://github.com/blockscout/docs to update the list of env vars at https://github.com/blockscout/docs/blob/master/for-developers/information-and-settings/env-variables.md and I updated the version to master in the Version column. Changes will be reflected in this table: https://docs.blockscout.com/for-developers/information-and-settings/env-variables.
• If I add new indices into DB, I checked, that they are not redundant with PGHero or other tools

[coveralls]

Pull Request Test Coverage Report for Build 1d96c37fba36269d87bcdf80fadb997996c007aa-PR-3352

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+4.3%) to 74.402%

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Files with Coverage Reduction	New Missed Lines	%
lib/block_scout_web/channels/address_channel.ex	2	36.96%

Totals
Change from base Build ce8b444aa4d68d18a6a6e13521a8ac4519bb7c5b:	4.3%
Covered Lines:	1991
Relevant Lines:	2676

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💛 - Coveralls