how to get the color I want in the articles?

Thanks for your help, but I could not get any change.
Surely it is my fault because I do not understand anything about css. So, please, be patient.
Where do I enter the code?
I tried modifying inserting your code into "template_css.css", at the beginning, just after /* basics */, so it was now but no way.

I tried also: adding code to existing lines, an it was now: but again no changes.
where am I doing wrong?
Thanks again

Put !important flag on all css properties you set

OK, Now it works, Thank you very much.

Hi again,
I must be dummy, I know that.
I thought I had finally solved the problem, but no!

I wrote a new article, and I'm not able to have the colours I want.
This time is text (not hyperlinks) that isn't working. Please see the images:
what I want (editor view) example fuchsia text
what I get black text

What have I to do?
Is there any way to get always what I see in the editor bypassing other choices?

Thanks again and... Merry Christmas

Can you use chrome "Inspect element" to see how that text is rendered inside HTML - goal is to check is there "style" attribute and whats its value

Thank you, using your suggestion I managed changing the colour, but is there any way to give priority to the editor so that the colours are wysiwyg in editor itself?
Have a nice evening