Hide Switch to modern interface

Is it possible to hide the "Switch to modern interface" through app.css (or any other file) ?

If so, what is the exact code that i need to put in app.css to hide the "Switch to modern interface" text and url.

P.s.
I understand it can also be removed from LoginController.js and then minify the .js again. But thats out of my league for now.

Thanks..

You can just remove this line:

<div id="update">Switch to <a href="/modern/">modern interface</a></div>

from web/release.html.

I do not have the above line in /web/release.html

<div id="update">Switch to <a href="/modern/">modern interface</a></div>

I only see this code in LoginController.js

    handleAdded: function () {
        var element = document.createElement('div');
        element.id = 'update';
        element.innerHTML = 'Switch to <a href="/modern/">modern interface</a>';
        document.getElementsByTagName('body')[0].appendChild(element);
    },

    handleRemoved: function () {
        var element = document.getElementById('update');
        document.getElementsByTagName('body')[0].removeChild(element); 

P.s.
When i add your line of code to web/release.html then i have two lines of "Switch to modern interface" on the front page.

<div id="update">GOGO Switch to <a href="/modern/">modern interface</a></div>

https://imgur.com/2n7vBJq

Is there still a way to hide "Switch to modern interface" without using minify ? If so in which file and what should i put there ?

It sounds like you are not using latest version. I would recommend upgrading first.

Thank you Anton. I did revert to 4.8 ( i think i used 4.9 where that "Switch to modern interface" line appeared). While 4.9 /Web still worked with 4.8 tracker-server.jar

Will need to implement my prior modifications from 4.8 into 4.10 server sourcecode and compile it to make it work with 4.10 web login.