O and 0 look too similar at a glance

When typing the text intervention, when there’s only an O on the screen, it looks to similar to a zero, and I end up typing that instead. I understand this may be on purpose to deter you from using the website, but I feel it’s just a bit of a nuisance and annoyance when I’m on the last few digits (because I use the long one) and I type O instead of 0 when I haven’t memorised it subconsciously yet.