Site title resizing and search bar for mobiles

Hi, I am using the Clean Journal child theme. I love it and it has been great to work with. However, am stuck with the site title and search bar. 1) How can I change the font size for the site title only for mobile screens? 2) Also the search bar appears just under the site title, how can I bring it down towards the end of my site, ideally above the Follow Us bar. My website link is www.hopscotchers.com Thanks in advance!