Your functions are all working nicely <3
The only issues I have seen so far is that your text remains in the input after submitting it (so does ours atm!) - also I think putting a tick on your markTodo button would be useful for UX as some people may be unsure what that button does until they've pressed it.
I would also recommend matching your colour palette more closely using the colours from the background. Love the background choice so elevating your design by bring it all together would look great, or even just using black for your title and softening the colour choices of your buttons would be good.
I really like your design and layout choices!
Your functions are all working nicely <3 The only issues I have seen so far is that your text remains in the input after submitting it (so does ours atm!) - also I think putting a tick on your markTodo button would be useful for UX as some people may be unsure what that button does until they've pressed it.
I would also recommend matching your colour palette more closely using the colours from the background. Love the background choice so elevating your design by bring it all together would look great, or even just using black for your title and softening the colour choices of your buttons would be good.