why don’t you use devtools to inspect the w3 code to see what values are they using for box-shadow ?
Alternatively, you may use some online box-shadow generator
I did that and i found a value box-shadow: 0px 2px 10px 0px rgba(0,0,0,12); and box-shadow: 0px 2px 5px 0px rgba(0,0,0,16); I tried for around 1hr 30min but couldnt get it to change color from black etc and some other things. I’ll try to use the generator thing and see if i can fix it.