# px unit

The absolute unit of measurement `px` represents a cell on the matrix of an electronic device. For example, if the width of a smartphone screen is `480px`, this means that there are `480` cells on the screen, each of which is equal to `1px`.

## Example

Let's give the rectangle a width of `200px` and a height of `100px`:

`<div> </div>` `div { border: 1px solid black; width: 200px; height: 100px; }`

:

## Example

Let's give the paragraph text a font of `30` pixels:

`<p> text </p>` `p { font-size: 30px; }`

:

## See also

- the `em` unit
  that specifies a size in em
- the `rem` unit
  that specifies a size in rem
- the `fr` unit
  that specifies a size in fr
- the `%` unit
  that specifies a size in percentage
- the `vw` unit
  that specifies a size in vw
- the `vh` unit
  that specifies a size in vh
- the `vmax` unit
  that specifies a size in vmax
- the `vmin` unit
  that specifies a size in vmin

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