Interesting... I see the sign in button when my window is big enough. However, when my window is too small it shows the menu button, and when I click on it there is no sign in button.
There is no log in button on the home page. And it does not navigate to my note page even if I'm logged in (ticked remember me for 30 days). In order to log in, I have to click on create an account, then scroll to the bottom to click on the small green log in text. This is just very redundant and silly UI design.