All solutions

There were/are two issues I found with my solution. (1) You can't have 0 as the leading number. Such equations like 0/2 and 0 + 3, would not work with my solution. How would one solve this exception?

(2) My solution doesn't display a comma at every third number (e.x: 340,455,000). What would be your method for implementing this?

One thing I found difficult for this project was making the mobile menu's grey/black overlay extend the whole height of the page. I currently have the height as a variable in JS that calculates the window's height, but are there any better solutions for this?

I overhauled my previous solution. But I still had difficulty figuring out:

(1) the desktop menu - how do I get the underline to show without shifting the whole menu moving up by 3px? (2) the mobile phone mockup - right now the image is position:relative but I know there has to be a better way to layout this image. Any suggestions? (3) Lastly, the footer is far too spaced apart for me - is there a better way to remove some of that extra space without individually accessing the li items?

I would also love for any constructive feedback on what I’ve currently implemented aside from those questions.