I don’t see it in your code. Try adding it in this section on line 4178 –
/* iPad/Tablets (portrait and landscape)
--------------------------------------------- */
I did see this –
.header-image .site-title a {
background-size: contain !important;
}
But you’ll need to add this code in that same section in order for it to work –
.header-image .site-title a {
background-position: center !important;
}
I just tested your site on my end and it appears to be working when I add the background-position: center !important
Let me know if that fixes it.