Tagline alignment on TwentySeventeen theme

Hello,

I am currently working on the site, I am attempting to align the tagline to the right hand side of the header, I used a margin but when I go to the mobile site the margin is too far and the tagline does not show. I would like to know how else could I align this right? I am aware that the ssl certificate on my site has expired I am working on renewing it.

Thank you all feedback welcomed.

The page I need help with: [log in to see the link]