Why isn't my bootstrap not getting loaded?

Question

Hii, I was practicing bootstrap and it was a working in sololearn compiler, can u check out my. Code please?
https://code.sololearn.com/W6sXd85mj0XJ/?ref=app

Answer 1

@HrCoder You're absolutely right but if you check the code you can see that it is not enough to solve his problem. I tried removing the "integrity" and "crossorigin" attribute (not sure why I had to do that, i guess CORS policy or bad Integrity key) and this finally solved the problem and Bootstrap loaded fine.

Here you go: https://code.sololearn.com/W0Bl9RQkd87G

Answer 2

that's rel="stylesheet" not ref="stylesheet"

ref wrong
rel right

Answer 3

for table header u can use
<th>Lmao</th>

Answer 4

Maz I got it but why isn't my table header dark?