Tips for pairing them
Use one as the base and the other as the accent, and add a neutral like cream, white or brown. In fashion, an olive jacket with a mustard sweater is a classic fall look. At home, an olive sofa with mustard pillows creates a warm, retro vibe. In design, they work for natural or food brands.
Contrast between them: 2.0:1. Don’t put text in one color on the other: it’s hard to read.