Can we bring back having the magic items coloured to show rarity, so much harder for my players who may be newer to know if the magic item they're choosing is off appropriate "rarity/level" 

But magical items colored by rarity is still a thing.

I think you need to check your settings or something mate because they're colour coded on here.

Standard Black: Common.
Green: Uncommon
Blue: Rare
Purple: Very Rare
Orange: Legendary
Whatever this colour is: Artifact

Yes they are color coded on both on the character sheet, and on the rest of the site too.

Quote from Cyb3rM1nd >>

I think you need to check your settings or something mate because they're colour coded on here.

Standard Black: Common.
Green: Uncommon
Blue: Rare
Purple: Very Rare
Orange: Legendary
Whatever this colour is: Artifact

Which settings? I, too, no longer see colour-coded items (though I've never adjusted any settings), and if there's a setting for it I have no clue where to find it.

Quote from KobeFadeaway24 >>

Quote from Cyb3rM1nd >>

I think you need to check your settings or something mate because they're colour coded on here.

Standard Black: Common.
Green: Uncommon
Blue: Rare
Purple: Very Rare
Orange: Legendary
Whatever this colour is: Artifact

 

Which settings? I, too, no longer see colour-coded items (though I've never adjusted any settings), and if there's a setting for it I have no clue where to find it.

 
Something on your browser, maybe, or device? I dunno. But the colours are there for me on site (browsers: Firefox, Edge, Chrome and Opera GX) and in the app (Android smartphone). 

This is a YOU thing not a D&D Beyond thing. 

Definitely a Me&D Beyond thing. Must've been a bug. Once again I did nothing, but all is as it should be once again.

I created a magic item that should've been blue (rare), but instead came out white. What did I do wrong?

Quote from Dragonbone63 >>

I created a magic item that should've been blue (rare), but instead came out white. What did I do wrong?

 
D&D Beyond doesn't even make items white as a colour - the code for it literally doesn't exist - so this is your browser and nothing anyone else can help with. Maybe check for any extensions that might alter css for a site?

All my other homebrew magic items are color-coded correctly.

Does not change the fact this is not a D&D Beyond thing.

There is no code that changes your, one, item to a different colour scheme than anything else. 

Check your browser/extension. 

Perhaps I should clarify- when I say it came out white, I was using the underdark mode. So in fact, I should say that it came out black. Does that change anything?

Quote from Dragonbone63 >>

Perhaps I should clarify- when I say it came out white, I was using the underdark mode. So in fact, I should say that it came out black. Does that change anything?

Maybe. In Underdark mode Common (and "Varies") items will be White instead of Black (the only difference) but Rare items are still blue.

Have you accidentally set it to Common (or "Varies") instead of rare?