How can you remove idea as an option in the community?

Here is the custom CSS I have in my community to for that exact use case:

/*start-- HIDE Idea option */
.qa-radio-button-topic-type-idea {
display:none;
}
/*end-- hide idea option */

/*hide-- Idea option from Create Post tooltip*/
.qa-topic-type .tooltip__content p:nth-of-type(3),
.qa-topic-type .tooltip__content label:nth-of-type(3){
    display: none;
  }
/*end-- hide*/