Which color became famously known as 'Bestseller Blue' in the publishing industry after dominating literary fiction book covers throughout the 2010s?

Book covers are powerful marketing tools in the publishing industry, with color choices significantly impacting consumer perception and sales. Colors evoke specific emotions and create genre associations that help readers identify books they might enjoy. This trivia question explores an interesting trend in bestselling literary fiction cover design that emerged in the 2010s and continues to influence the market today.

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Teal blue (a specific shade that became ubiquitous on award-winning and commercially successful literary fiction)
Crimson red (traditionally associated with thrillers but adopted by literary publishers to signal emotional intensity)
Mustard yellow (popularized after the success of 'The Goldfinch' and similar literary blockbusters)
Forest green (used to signal environmental themes in contemporary literature)