From the script:
const pre = document.createElement("pre")
pre.innerText = "You are not authorized to access the Glitch Console."
document.body.appendChild(pre)
… but also from the page:
body {
...
font-size: 0;
}
If you wanted to get rid of the space under the iframe, I think you’d be better off setting display: block
on the iframe. Currently the error message is invisible when you’re not logged in.