You mean how to display the colors?
If that's the case, the different result is due to the difference between using this markdown code tag (a single ' around your code) and a this one (three ''' before and after your code).
Here is an with just ' around your code:
.example {
background-size: cover;
}
And here is the same thing with ''' around your code:
.example {
background-size: cover;
}
I think the second one is applied automatically if you select the empty line before and after your code (and not just the code itself) before clicking on the code button in composer, but there are maybe other ways.
Also, on your page, I see markdown code tag inside other markdown code tag. I don't think it can work, as it's the same character to open and close the code area.
