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Note: The steps below are not applicable for the default themes in Theme Manager.
If you want to use a logo you already have, or you want to create a logo to use in your store, be aware of a few issues that may arise depending on your logo and the template you choose.
If your logo was created with a specific background color in mind, your logo may appear as a block on top of the header background color or image.
If your logo was created with a specific background color in mind, but was made with a transparent background for that color, you may see a halo effect surrounding your logo.
These problems are caused because the logo was created with a specific background color in mind. Many logos are created with a white background, and for this reason most of the color palette choices for generic templates have white as the header background color.
If your logo uses a specific background color and you want to change your header background color to use that same color, this can be done in the Store Editor.