My iframe stubbornly stays at one size

[BlazingCobaltX]

Hi all, see this page: https://blazingcobaltx.neocities.org/musicroom/jukebox

By pressing any of the images an iframe appears into the container next to it. I would like this box to be a bit longer, but every attempt at adjusting the height of the iframe or the container itself are met with no movement. Am I missing something in the code or is this related to a property of the iframe itself? Ideally I would like both boxes to be of equal size.

[Rubbereon]

Don't know what to tell you, but when I changed the iframe's height to height="500px" it didn't stubbornly stay at 390px even when I clicked on different images, it displayed correctly at the intended height I've set, so I dunno what's your problem here. Try control + F5 after changing the html to make sure the changes stick because your browser might be caching your html page.