Site title and description not aligning properly

REQUEST: Help me to properly left align the site title and description/tagline.
DEETS: When viewed as landscape, the left-aligned site title indents toward the right, not aligning perfectly over the left-aligned description/tagline. (When viewed as portrait/mobile, the problem goes away because the two elements switch to center alignment.) This has been a problem since day 1, not a new development. The problem goes away when I switch to other random themes. The problem remains when I switch to the Colormag parent theme.

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