Proper Capitalization of CSS Declaration Values


My code is not behaving incorrectly- I just have a quick proper usage question.

I noticed that in the lesson around styling and creating CSS Rules, that all the values (word values) were capitalized. i.e Green or DarkSlateGray. Are these capitalized for propriety's sake? I also noticed that not capitalizing them did not seem to make difference. Would you all recommend capitalizing all values in a CSS Rule?

h1 {
  font-size: 55px;
  color: Brown;
  font-family: Bodoni;

* {
  font-family: calibri;

ul {
  color: green;

  color: red;


hey i need help can you help me please.


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