The navigation bar links are weird cuz you turned off css, what did you think would happen?
try it!
add /a/b/c to the url, with b and c being integers, and a being +, -, x, ÷ or ^.
ex. https://d.bwabam.com/calc/x/7/6
if you can't type the ÷ symbol on your key board, copy it here: