Are there specific words for class in css?

Question

I am attempting to alter 2 different paragraphs with different design elements and I set each css p class to “one” and “two” are there specific names or am I messing something else up in my project?
https://code.sololearn.com/WR8DuvTiVg4n/?ref=app

Answer 1

Please next time remember to link your code in post.

I think code is similar to this.

<p class="one"> Paragraph 1</p>
<p class="two"> Paragraph 2</p>

Now these classes can be referred by adding a . (dot)

.one{
//styles here
}

.two{
//styles here
}

note that dot is important.