Is there a way I can add some CSS to effect the font size on mobile screens? A header h2 tag looks good on the desktop version, but the line needs to wrap on the vertically oriented cell phone screen.

Thanks,
Steve

Sure, you can try this in your Theme options -> Custom CSS, or Child theme CSS file:

@media only screen and (max-width: 768px) {
    h2 {
        font-size: 18px;
    }
}

For theme heading elements, there’s a special setting where you can override the font size for mobile.