HTML, body, head, header, footer, main, H1 - H6, p, sub, sup, form,
div, span, dt, dd, table, oi, ui, li, style, script
reduceimages.com
selector { att : value; }
csszengarden.com
website - picture, title, design
group selector (css book)
, -> group selector / * universal / > - child selector
reset css file - download pdf file
a tag - a:link, a:visited, a:hover
style inheritance
https://fonts.google.com
color -> RGB /0 to 255/ - saturation, bright, contrast
ten symbols to form a number -> 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
gray - xyz - x=y=z
RGBA