Question Numbering

I am trying to number the questions but the only option provided in settings is:

“1 Question
Here is the question.”

or no numbering at all. What I want is:

“1. Here is the question”

I can do this with css list-style: decimal and it’s perfect in dev mode, but when I add it to the style sheet it’s not coming up. What am I doing wrong?

.wpProQuiz_listItem {
list-style: decimal !important;
}

Thanks!

https://www.ads-software.com/plugins/wp-pro-quiz/