Dear friends! I am so excited to learn coding on my own with great support of freecodecamp, Please have a look at this http://codepen.io/pbweb/full/LkgJYv/ and tell me what’s doesn’t look or work as you excpected? Any bugs? Suggestions? Feel free to critisize. Thanks in advance!
Ps.It supports “traditional” opearational order: * and / have higher priority over + and -
It seems to me box shadow got broken on the way - pressed button is 2 pixels taller than non-pressed one. Disabling box shadow fixes this issue.
I’m using chrome.
Overall, I love it. Well done!
Thank you, Yuri. I will try to solve it now=)
I did a similar thing while working on buttons micro-project (studying Stylus pre-processor, basically) and I made it this way: when the button is not pressed, it has a box-shadow. When the button is pressed, box-shadow disappears (moves directly under the button). You can see the result in this codepen
I aimed to make a button that looks somewhat 3D. Its easiest to see with inverted style button. Feel free to use the code if you want.
I wonder how much you were inspired by the calculator from the example. It looks the same. Have you really made it without looking at the code from the example? 
If so, chapeau bas.
thank you for the feedback=) When I was making my weather app - most of the time(probably a day) I spent on deciding how to organize my design - images, colors, fonts etc. It was not productive.And then when I got to calc app - I decided not to think much about design. Just copy existing and that’s it. Anyway - when I will work in the real envirounment - I will do the absolute majority of my work - according to spec.
And also it was very easy to copy the existing design(just google - how to add inner and outer shadows etc.)
The most challenging - was javascript part - in this step I learned a lot(about floating point number precision, throwing and catching exceptions in javascript).Big thank to freecodecamp and everyone involved!)