.site-title BIG text showing on mobile

I have been toying with the Sydney theme for a few days and I think it suits my needs quite well.
The only problems I cannot overcome relate to viewing my site on a mobile device.
The two problems are:

The .site-title text looks MASSIVE on my phone, yet I have it set to a tiny font size and looks correct when I use a computer.

The menu symbol on the mobile device is right on top of the scrolling text.
I did search thie support forum before posting and found one other instance of this problem from earlier in this year. The reply said that the slider text would be turned off in a future release of the theme, but I cannot see how to do this (or relocate the menu symbol).

MANY thanks,