CSS User Interface

CSS User Interface (UI) properties allow you to resize elements, outline elements, and more.

The resize property specifies if (and how) an element should be resizable by the user.

Let the user resize this div element.

To resize: Click and drag the bottom right corner of this div element.

The outline-offset property adds space between an outline and the edge or border of an element.

This div has an outline offset of 15px.

Example

div {
  resize: both;
  overflow: auto;
}

div.ex2 {
  outline: 4px solid red;
  outline-offset: 15px;
}