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Custom background size? :: Help and Tips - Steam Community
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Graphical Assets - Overview (Steamworks Documentation)
What are the dimensions for Steam Library backgrounds?
A Handy Guide to Graphical Assets on your Steam Store Page
custom background resolution? : r/Steam - Reddit
How To Add Custom Art To Steam Library Games - SlashGear
How to add custom artwork to your Steam library games - XDA …
How does Steam set a game's background in the Library?
Proper Steam game background image dimensions? : r/SteamDeck - Reddit