Here is a problem I solved for you.
I couldn’t understand why my customization of changing font-size in site-title wasn’t applying to mobile.
Poking around in the Firefox Inspect tool, I discovered that the CSS code that was rendered was missing a comma.
The code rendered was
@media (max-width: 768px){.navigation-branding .main-title{font-size:26px;}}
Once I added a comma just after “.navigation-branding”, the font-size was applied correctly.
Looking forward to the next update with this included!