Hello @PamelaC882 ,
The larger it is within the 5MB limit, the better. Generally speaking, it's better to have whitespace on the sides of it in the actual image, so when mobile resizing occurs, it still looks proportional - i.e. the best setup would be to have your logo + side whitespace be at least 650px wide.
For more info and tips regarding logos, I'd recommend checking out this article in our Help tab / Knowledge Base site.
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