8️⃣

4.8 CSS Outline

An outline is a line that is drawn around elements, OUTSIDE the borders, to make the element "stand out".

image

CSS has the following outline properties:

  • outline-style
  • outline-color
  • outline-width
  • outline-offset
  • outline

Note: Outline differs from borders! Unlike border, the outline is drawn outside the element's border, and may overlap other content. Also, the outline is NOT a part of the element's dimensions; the element's total width and height is not affected by the width of the outline.

CSS Outline Style

The outline-style property specifies the style of the outline, and can have one of the following values:

  • dotted - Defines a dotted outline
  • dashed - Defines a dashed outline
  • solid - Defines a solid outline
  • double - Defines a double outline
  • groove - Defines a 3D grooved outline
  • ridge - Defines a 3D ridged outline
  • inset - Defines a 3D inset outline
  • outset - Defines a 3D outset outline
  • none - Defines no outline
  • hidden - Defines a hidden outline

CSS Outline Width

The outline-width property specifies the width of the outline, and can have one of the following values:

  • thin (typically 1px)
  • medium (typically 3px)
  • thick (typically 5px)
  • A specific size (in px, pt, cm, em, etc)

CSS Outline Color

The outline-color property is used to set the color of the outline.

The color can be set by:

  • name - specify a color name, like "red"
  • HEX - specify a hex value, like "#ff0000"
  • RGB - specify a RGB value, like "rgb(255,0,0)"

CSS Outline - Shorthand property

The outline property is a shorthand property for setting the following individual outline properties:

  • outline-width
  • outline-style (required)
  • outline-color

The outline property is specified as one, two, or three values from the list above. The order of the values does not matter.

CSS Outline Offset

The outline-offset property adds space between an outline and the edge/border of an element. The space between an element and its outline is transparent.

image

Previous Section

Next Section

⚖️

Copyright © 2021 Code 4 Tomorrow. All rights reserved. The code in this course is licensed under the MIT License. If you would like to use content from any of our courses, you must obtain our explicit written permission and provide credit. Please contact classes@code4tomorrow.org for inquiries.