editor.css in Gutenberg 23.2.0, at build/styles/block-library/columns/editor.css
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.wp-block-columns :where(.wp-block) { |
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max-width: none; |
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margin-left: 0; |
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margin-right: 0; |
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} |
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|
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html :where(.wp-block-column) { |
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margin-top: 0; |
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margin-bottom: 0; |
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} |
