"Oops, try again" but my code is good


- https://www.codecademy.com/courses/web-beginner-en-UuBLw/0/2?curriculum_id=50579fb998b470000202dc8b
- https://www.codecademy.com/courses/web-beginner-en-WF0CF/0/3?curriculum_id=50579fb998b470000202dc8b

I'm facing difficulties due to a bug. In several excercices (the first is the n°2 of the course Design a Button for Your Website) there is a bug that explains me that i failed in my code... but i didn't fail! It tells me for example:
"Oops, try again. Did you remember to give your div a height of 50px? It looks like it's 49.8px."
I clicked ctrl + 0, but it doesn't change a thing.
I've found out that if i zoom a bit (one tick of scrolling), it changes and it becomes OK.
Every tick of scrolling, in or out, makes it wrong, and tells me that i have 49,something or 50,something px, while my code says: height: 50px;.
So i can continue by zooming in once, compared to the default zoom position (ctrl+0), but every other zoom position, or a ctrl+0, don't work and show me a false value.


Here a compilation of the Browser specific problems encountered

fadeTo in jQuery Introduction 11/13 set opacity to 1

opacity not recognized by browser
fontsize NOT recognised, by browser

I'm using Chrome.
font-size is 16.3636360168457px instead of 16px.
You have to enter the 'Settings' => 'Advanced settings' (in the very bottom)
and to chose 100% in the Page scale (in my browser it was 125%).

Color not recognized by browser


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