CSS: Background-clip: border-box _ HELP

Question

I want the linear-gradient to be on the border, (my code doesn't seem to work).
Also if the border takes the linear gradient, the. The background/color: should be transparent.

https://code.sololearn.com/WrDX55eX88rN/?ref=app

Answer 1

border-image: linear-gradient(50deg, blue, yellow);
border-image-slice: 1;

https://code.sololearn.com/WroFXn1pSSKP/?ref=app

Answer 2

Try without vendor prefixes 16.17 lines

Answer 3

-webkit-

Answer 4

Anna what is vendor prefix 16.17 lines?