Logo size – I’m stumped at how it works

Hey there. Most times, when a theme customize section lets you upload a logo, there is also a field where we can set either the desired height or width of the logo. In the case of the Temptation theme, however, the logo is always set to be 100px high. I understand this has something to do with responsive images but I can’t seem to find where in the template code these settings are managed.

I might have to just change my logo to meet the needs of the theme, but if you can provide help to understand this, I would appreciate it.