We use two versions of your logo in Theme Repos:
We do this because on some pages, and when you scroll, you want to see the dark logo, and sometimes vice versa. That's how you catch it.
Make sure you upload the logo in the same size, so Dark & Light must have the same resolution.
Logo width in pixels
This specifies the width of your logo in pixels, as it appears in the header. Play with it a bit, depending on the file format you've uploaded. Good luck!
Maximum dimensions we display
The maximum dimensions we display are 100 pixels high and 145 pixels wide.
You can use .jpg, .png, .gif files.