How to quickly copy the box style with interior elements?

The problem is this. For instance, I pull a new template to the site. But on the website there are blocks that have not yet been drawn up styles in the new template.
And in order not to bother, I want to move this block entirely with the old template. How to quickly copy styles for this block, including the styles sub elements. Maybe there is some browser extension?
June 10th 19 at 15:27
2 answers
June 10th 19 at 15:29
ChromeDevTools, Versty on the BEM methodology, and keep the blocks in separate files. Or use gistы from github.
June 10th 19 at 15:31
Use sass (or less), the stored styles of the units and elements in separate files collected using gulp

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