ID selectors

The CSS ID selector matches an element based on the value of its id attribute. In order for the element to be selected, its ID attribute must match exactly the value given in the selector.

/* The element with id="demo" */
#demo {
  border: red 2px solid;
}

Syntax

#id_value { style properties }

Note that this is equivalent to the following attribute selector:

[id=id_value] { style properties }

Example

CSS

#identified {
  background-color: skyblue;
}

HTML

<div id="identified">This div has a special ID on it!</div>
<div>This is just a regular div.</div>

Result

Specifications

Browser compatibilityUpdate compatibility data on GitHub