Change Header Font on SINGLE page in Mobile View

Site URL: http://cleinsurancebrokers.com/get-quote

Having trouble with CSS code to reduce the font size so its wrapping and smaller on mobile vertical view, as the code I was using was effecting site wide and I need it to NOT be site wide and just on this LP.

I'd also like to change the font, while im at it.

Thank you!! 

http://cleinsurancebrokers.com/get-quote

Anyone able to help? I imagine this isnt too difficult but I can't find the right code.

The url doesn't exist

Sorry page was updated last night. 

https://cleinsurancebrokers.com/get-a-quote

21 hours ago, GoodSmartIdea said:

Sorry page was updated last night. 

 

https://cleinsurancebrokers.com/get-a-quote

Add to Design > Custom CSS

/* get a quote text mobile */
@media screen and (max-width:767px) {
div#block-a22ac5a65ca49b555128 * {
    font-size: 18px;
}
}