#21282C相关的系统推荐颜色搭配（系统根据明暗和色调推荐的颜色）
#21222C #25212C #2A212C #2C2128 #2C2122 #2C2521 #2C2A21 #282C21 #222C21 #212C25 #212C2A #3B474E #566771 #4E423B #716056
#21282C相关的相邻颜色（颜色轻微变化，相似度极高）
#212820 #212821 #212822 #212823 #212824 #212825 #212826 #212827 #212828 #212829 #21282A #21282B #21282D #21282E #21282F