Text highlighting for ES6 template literals (backticks) in IntelliJ IDEA

In 2019.3:

Settings > Editor > Color Scheme > General > Code > Injected language fragment

And deselect Background

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I finally found the answer. I'll let this stay in case anyone else wonders.

Editor -> Colors & Fonts -> General -> Injected language fragment -> Uncheck background on the right side panel

Cheers

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... and for some reason they've changed this again in 2017.2

Now go to Preferences -> Editor -> Color Scheme -> General -> Injected language fragment and uncheck "Background"