Run jquery code?

i need to insert a button into the octoprint-server website and run a jquery code, when press it.

the reason is, i want to add a css style to the webcam img tag, to zoom into it.
it would be enoogh, when i can add transform:scale(1.5).
but i don'T know, how i can do it..
can i change the html code from the octoprint-server?

thank you

Why not just use something like UI Customizer, which has an advanced section that allows setting css overrides as you want. There's also OctoPrint-CustomCSS.

but i want to toogle the css style