Your website stays readable when you change its look

When you change your website's colours, small grey writing like captions and price notes is darkened just enough to read on every background, and the Theme tab tells you if a colour would make some writing hard to read.

Readable small print: captions and price notes are darkened just enough to read wherever they sit, the next time you change your look
A warning, not a surprise: the Theme tab tells you when a colour would leave some writing hard to read, and keeps your colour