If you don't have a logo for your business, you can easily create one in Canva.
Create a logo size that is a minimum of 54 px high by 243 px wide. If your log is bigger it will be auto-sized.
Once it's designed, and you click on the "Download" button (as shown below), be sure to select PNG as the file type and click the box to make it a transparent background.
If your logo is jpg file type (instead of png) or if you don't click "Transparent background" in Canva, your logo will show with a white box around it like this:
And you want it to look like this: