I see this come up every once in a while and I realised that not everyone knows that this is fixable.
Before:
After:
All you have to do is open Team Fortress 2/platform/resource/sourceschemebase.res in the text editor of your choice, find Panel.BgColor (should be around line 124), and change the Blank to something else defined in the ///////COLORS/////// section at the top of the file (you can also add your own color; the numbers are RGBA). I use AchievementsDarkGray, as seen in the above image.
Note: Panel.BgColor also defines the color of a game's console, so setting it to 255 0 0 255 will also make your console red. As far as I know there is no way to change the model browser color without changing the console color.
EDIT 2017-08-08: Apparently Valve moved a bunch of files from /platform/resource to a .vpk, and since this isn't in /tf you can't just place the new file in tf/custom and have it work; I'm looking for a workaround but there may not be one ¯\_(ツ)_/¯
Before:
After:
All you have to do is open Team Fortress 2/platform/resource/sourceschemebase.res in the text editor of your choice, find Panel.BgColor (should be around line 124), and change the Blank to something else defined in the ///////COLORS/////// section at the top of the file (you can also add your own color; the numbers are RGBA). I use AchievementsDarkGray, as seen in the above image.
Note: Panel.BgColor also defines the color of a game's console, so setting it to 255 0 0 255 will also make your console red. As far as I know there is no way to change the model browser color without changing the console color.
EDIT 2017-08-08: Apparently Valve moved a bunch of files from /platform/resource to a .vpk, and since this isn't in /tf you can't just place the new file in tf/custom and have it work; I'm looking for a workaround but there may not be one ¯\_(ツ)_/¯
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