Media query rules in index.html doesn't reflect

I reinstalled Jitsi on a self hosting Ubuntu 21.04.
Everything works fine except one thing:
I modified the file /usr/share/jitsi-meet/interface_config.js
and also index.html.
Problem is that rule with media query like the following doesn’t reflect at all. other rules work fine.
@media (max-width:800px){
p.details {
position:absolute;top:26vw;
font-size:5.5vw;
color:#fff;
left:2vw;
}
}
Any idea?
Thx

Where exactly did you place that code?

Ths Sagui,
I put it here:
/usr/share/jitsi-meet/index.html
I. Lesher

Before or after all.css? You might need some !important I suppose?