If you want to upload a larger logo, you can. Just add this code in your responsive section (in the iPhone or tablet section) and your logo will resize when viewed on smaller browsers –
.header-image .site-title a {
background-size: contain !important;
}
We can line it up with the nav, but if you add a larger logo in, the code will have to be changed again. So first add the logo that you want, then let me know once it’s in there and I’ll take a look and tell you what all will need to do. It’s pretty similar to that other link I posted, but the measurements won’t be exact since everyone has a different size logo.