I asked for help making the expanded images fully expand here. They got something workable, but it gets rid of the sidebar. I'm hoping for something where the image just covers the sidebar.

I found the class, but I don't know how to write the CSS to make it go all the way across the screen regardless of the parent. So it would start with .img-expanded:not(.banner):not(.avatar-overlay) { } but I need to know what goes in the brackets.

Right now, the only method I found is to click on the expando, then right click on the image and open it in a new tab. Is there a way to make it so I can just click it once? I can't imagine any possible scenario where I'd want to see a large but not full size image.

I'm using the browser on my computer if that's relevant.

Edit: I got it to work using the Stylus addon and:

.img-expanded:not(.banner, .avatar-overlay) {
    max-height: unset;
    max-width: 100vw;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    outline: auto;
    outline-color: black;
    z-index: 1;
}

I also made it outline any expandos with:

/*Note: Links are exactly the same except without bg-transparent, so using not(bg-transparent) instead will outline the links instead of the expandos. Also, they're outlined orange unless you change it, so you could take that off, give them all outlines, and you can tell which they are based on the color.*/
.thumbnail.rounded.overflow-hidden.d-inline-block.position-relative.p-0.border-0.bg-transparent {
    outline: auto;
}