Applying a font family to a whole page doesn't work

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HTML

I want to apply a single font to an entire page, but something is stopping me from doing it.

What I have tried:

I checked online but nothing helped me, some said use this code:

*{
font-family: Verdana;
}


I tried putting it in the body, head, nothing, some said instead of * to use body, tried it, didn't work. I saw if my code even worked in general, I tried to change the font of a single paragraph with a selector and it worked.

*{
font-family: Verdana;
}



what
owo

.btn {
font-size: 55px;
}
.btn-danger {
background-color: red;
}
.btn-success {
background: rgba(128, 0, 0, .25);
font-family: fantasy;
}

blacks111

.Cx {
background-color: grey

}