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Thanks COBOLdinosaur, interesting and useful article but not quite what I was looking for. Davej, the colorpicker helped me. The colorvalue entry field accepted 3 character hex colors. They actually do translate from n to nn. W3Schools doesn't say that anyplace that I could find. 1h 2h dec 0 00 0 1 11 17 2 22 34 3 33 51 4 44 68 5 55 85 . . . e ee 238 f ff 255 So, each 1h step is separated by seventeen 2h steps, and it all fits perfectly! I'm slow, sorry. Yes, Davej and Dsonesuk you did say that but it just didn't fit in my thinking. Thanks all for your help!

This points to a color range of f * f * f = 4096 colors with no documentation.

I'm looking at a piece of code that uses: blockquote cite, blockquote small { color: #333; font-size: 15px; font-size: 1.5rem; font-family: "Noto Sans", sans-serif; line-height: 1.6; } input:focus, textarea:focus { background-color: #fff; border: 1px solid #c1c1c1; border: 1px solid rgba(51, 51, 51, 0.3); color: #333; } Is there something on the W3Schools tutorial that defines how the three character hex color codes are set? I've found these three uses in the tutorial but no description on how they are set. #section1 {padding-top:50px;height:500px;color: #fff; background-color: #1E88E5;} <style> .w3-theme { color:#fff !important;background-color:#3f51b5 !important} .w3-theme-light { color:#000 !important;background-color:#e8eaf6 !important} /*Generated CSS:*/ .w3-theme-d4 {color:#fff; background-color:#3b3b11} .w3-theme-d3 {color:#fff; background-color:#5f5f1b} .w3-theme-d2 {color:#fff; background-color:#838325} .w3-theme-d1 {color:#fff; background-color : #a7a730} .w3-theme {color:#000; background-color:#c7c73d} .w3-theme-l1 {color:#000; background-color:#d2d260} .w3-theme-l2 {color:#000; background-color:#dcdc84} .w3-theme-l3 {color:#000; background-color : #e6e6a8} .w3-theme-l4 {color:#000; background-color : #f0f0cb} .w3-theme-l5 {color:#000; background-color : #fcfcf3} Any pointers are appreciated, thanks.