Testimonial Section Title is Tiny on Mobile. CSS solution to increase size?

When I enter the mobile view of my testimonial section, the title is super small (see attachment). When inspecting my site, I saw that ".user-items-list .list-section-title" is the element name, but when writing a mobile query the text only gets condensed when I increase the size.

I'm wondering if the container the title is in is somehow constraining the size? Below is the code I used that does change the font size, but it doesn't actually get larger, the kerning just gets super tight. Is it possible to make the "Client Success Stories" title to be 30px? Thank you!

https://iguana-groundhog-8k32.squarespace.com/
Password: fshr2013

@media only screen and (max-width:768px)
{.user-items-list .list-section-title {
	font-size: 30px;
  }}

@tuanphan THANK YOU!