Logos should have a wide aspect ratio, not a square icon.
Logos should be no wider than 600px, and no taller than 60px.
Always retain the original aspect ratio of the logo when resizing. Ideally, logos are exactly 60px tall with width <= 600px. If maintaining a height of 60px would cause the width to exceed 600px, downscale the logo to exactly 600px wide and reduce the height accordingly below 60px to maintain the original aspect ratio.