Custom login screen's background image not covering

I am facing an issue on the custom login screen. I set the Background size to cover, but it is not covering the page.

During the chat we’ve checked the Custom CSS and noticed that commenting/removing a line seems to fix the issue. This is how it should be:

html body {

display: flex;

align-items: stretch;

align-content: flex-start;

background-position: 100% 100%;

/* background-size: 60%; */


So the “background-size: 60%;” property needs to be disabled.