Todo web app with 100 lines of PHP and CSS

So I got, like many others, caught into the productivity cycle, trying to find the best app for this and that. Notetaking, todo lists, calendars. And all are extremely bloated or paid. I fell in love with the todo.txt CLI program and simply made a web equivalent, so I can perform those simple actions on the go from iOS as well. I initially made a robust PWA, but then started to question every part until i got to 100 LOC. Im considering a box listing the overdue stuff, but that will be the last overhead.