Change text size of Simple List Item Title?

Site URL: https://carinaboutiquetesting.squarespace.com

I'm trying to change the text size here (highlighted on the first one) 

The block is a simple list? It's the item title. Password is 12345

I was able to do this on my site using this:

.list-item-content__title {
  font-size: 1.8rem!important}

This can be changed without custom code by going to Edit Content > Design > Style > Adjust Text Size.

@jackattack1024 unfortunately even if I change the size in settings it does nothing, I did try that several times and even tried other options and custom code. But @karleideithat fix worked!!! Thank you SO much!