What is bug in my code (CSS)

Question

Calvins code works but mine dont
What is the missing thing
https://code.sololearn.com/WciLcLqR2r5n/?ref=app
https://code.sololearn.com/WcsECdGKfbWD/?ref=app

Answer 1

Your code is almost there, the input under the center class in the CSS section is incomplete, as well as lacking the -moz-range-thumb part.