I feel bad for posting this as a bug because is so stupid but…
BMS doesn’t show an icon. Is this normal? if not, can somebody send me the icon, please?
The game is a third-party mod at this moment, so it doesn’t have it’s own library icon. However, i quickly created one for you 
Just download the image, go to your library, right click Black Mesa and select “Use custom image…”. Works in Big Picture too
Awesome, thank you so much!!
Edit: out of curiosity, is there an official desktop icon for the mod?
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Here’s the grid-view image I made for myself (to use it for your computer, follow the same directions as in this thread).
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Right click the mod in Steam and select “Create Desktop Shortcut”. It will give it the proper icon. 
That looks really fancy euphonic!! Thank you guys!