Site header in Tatami theme off-center

I noticed I am unable to center my logo in Tatami, because the theme design is off-center – the heading logo area does not align with the post image or column. By default it is off-center to the left of the center column by a significant amount of space. Additionally, the right column is narrower than the left column leaving the header alignment problem with the center column even more noticeable. You can see the problem here: My logo is larger than Tatami’s, so it sits even farther to the right. Even if it were as small as Tatami’s (easy to change), it is still not aligning in the theme demo.

Thank you, Mollie