# How to override the style definitions in Reference.nb? [duplicate]

Mathematica 11.1.0 introduces a new look to its documentation, which doesn't look good on my Windows machine. After some digging it turns out the styles are largely defined in Mathematica\SystemFiles\FrontEnd\StyleSheets\Wolfram\Reference.nb. But modifying this file directly triggers a beep. What's the recommended way to override these styles?