Resolutions:

Big picture

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Small picture

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Left offset: -

Don't forget to maximize your browser window. This method relies on the Steam profile style.

Don't forget to check "Disable slider" if you want to crop the whole image.

WARNING: Image is too small. Make sure that your image is at least width of 626 pixels, and height of 122 pixels.
You can crop the image with it's original size, but it'll look small on the showcase.

Resize image to fit whole showcase