When working with positioned elements, you often write code like this:
.some-element {
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
}This can be simplified using an inset propety:
.some-element {
position: absolute;
inset: 0;
}Or if you have different values for top, right, bottom and left, you can set them respectively in the order like: inset: -10px 0px -10px 0px. This shorthand works the same way as margin.
Other examples:
https://developer.mozilla.org/en-US/docs/Web/CSS/inset