Tā jiā shì xìnglěngdàn fēnggé, quán shì hēibái huī.
Her place is decorated in 'cold' minimalist style - all black, white, and grey.
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Two distinct modern uses: (1) the medical/literal sense - frigidity, low libido. (2) Internet/lifestyle slang since the mid-2010s: 性冷淡风 'cold-tone aesthetic' for Muji-style minimalist design - clean lines, monochrome palette, no decoration.
mistakes
Don't read 性 here as just 'gender'. In this compound it's 'sexuality/sexual desire' (compare 性欲 'libido'). 冷淡 means 'cold/indifferent', so the literal sense is 'cold/indifferent toward sex'.
