How to Add Outline Using?

By | July 1, 2022
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An outline is a line drawn outside the element’s border.

CSS Outline

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

CSS has the following outline properties:

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

The following example shows the different outline-style values:

Example

Demonstration of the different outline styles:

<!DOCTYPE html>
<html>
<head>
<style>
p {outline-color:red;}
p.dotted {outline-style: dotted;}
p.dashed {outline-style: dashed;}
p.solid {outline-style: solid;}
p.double {outline-style: double;}
p.groove {outline-style: groove;}
p.ridge {outline-style: ridge;}
p.inset {outline-style: inset;}
p.outset {outline-style: outset;}
</style>
</head>
<body>
<h2>The outline-style Property</h2>
<p class="dotted">A dotted outline</p>
<p class="dashed">A dashed outline</p>
<p class="solid">A solid outline</p>
<p class="double">A double outline</p>
<p class="groove">A groove outline. The effect depends on the outline-color value.</p>
<p class="ridge">A ridge outline. The effect depends on the outline-color value.</p>
<p class="inset">An inset outline. The effect depends on the outline-color value.</p>
<p class="outset">An outset outline. The effect depends on the outline-color value.</p>
</body>
</html>

Result:

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)

The following example shows some outlines with different widths:

<!DOCTYPE html>
<html>
<head>
<style>
p.ex1 {
  border: 1px solid black;
  outline-style: solid;
  outline-color: red;
  outline-width: thin;
}
p.ex2 {
  border: 1px solid black;
  outline-style: solid;
  outline-color: red;
  outline-width: medium;
}
p.ex3 {
  border: 1px solid black;
  outline-style: solid;
  outline-color: red;
  outline-width: thick;
}
p.ex4 {
  border: 1px solid black;
  outline-style: solid;
  outline-color: red;
  outline-width: 4px;
}
</style>
</head>
<body>
<h2>The outline-width Property</h2>
<p class="ex1">A thin outline.</p>
<p class="ex2">A medium outline.</p>
<p class="ex3">A thick outline.</p>
<p class="ex4">A 4px thick outline.</p>
</body>
</html>

Result:

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)”
  • HSL – specify a HSL value, like “hsl(0, 100%, 50%)”
  • invert – performs a color inversion (which ensures that the outline is visible, regardless of color background)

The following example shows some different outlines with different colors. Also notice that these elements also have a thin black border inside the outline:

<!DOCTYPE html>
<html>
<head>
<style>
p.ex1 {
  border: 2px solid black;
  outline-style: solid;
  outline-color: red;
}
p.ex2 {
  border: 2px solid black;
  outline-style: dotted;
  outline-color: blue;
}
p.ex3 {
  border: 2px solid black;
  outline-style: outset;
  outline-color: grey;
}
</style>
</head>
<body>
<h2>The outline-color Property</h2>
<p>The outline-color property is used to set the color of the outline.</p>
<p class="ex1">A solid red outline.</p>
<p class="ex2">A dotted blue outline.</p>
<p class="ex3">An outset grey outline.</p>
</body>
</html>

Result:

HEX Values

The outline color can also be specified using a hexadecimal value (HEX):

Example

<!DOCTYPE html>
<html>
<head>
<style>
p.ex1 {
  border: 2px solid black;
  outline-style: solid;
  outline-color: #ff0000; /* red */
}
p.ex2 {
  border: 2px solid black;
  outline-style: dotted;
  outline-color: #0000ff; /* blue */
}
p.ex3 {
  border: 2px solid black;
  outline-style: solid;
  outline-color: #bbbbbb; /* grey */
}
</style>
</head>
<body>
<h2>The outline-color Property</h2>
<p>The color of the outline can also be specified using a hexadecimal value (HEX):</p>
<p class="ex1">A solid red outline.</p>
<p class="ex2">A dotted blue outline.</p>
<p class="ex3">A solid grey outline.</p>
</body>
</html>

Result:

RGB Values

Or by using RGB values:

Example

<!DOCTYPE html>
<html>
<head>
<style>
p.ex1 {
  border: 2px solid black;
  outline-style: solid;
  outline-color: rgb(255, 0, 0); /* red */
}
p.ex2 {
  border: 2px solid black;
  outline-style: dotted;
  outline-color: rgb(0, 0, 255); /* blue */
}
p.ex3 {
  border: 2px solid black;
  outline-style: solid;
  outline-color: rgb(187, 187, 187); /* grey */
}
</style>
</head>
<body>
<h2>The outline-color Property</h2>
<p>The color of the outline can also be specified using RGB values:</p>
<p class="ex1">A solid red outline.</p>
<p class="ex2">A dotted blue outline.</p>
<p class="ex3">A solid grey outline.</p>
</body>
</html>

Result:

HSL Values

You can also use HSL values:

Example

<!DOCTYPE html>
<html>
<head>
<style>
p.ex1 {
  border: 2px solid black;
  outline-style: solid;
  outline-color: hsl(0, 100%, 50%); /* red */
}
p.ex2 {
  border: 2px solid black;
  outline-style: dotted;
  outline-color: hsl(240, 100%, 50%); /* blue */
}
p.ex3 {
  border: 2px solid black;
  outline-style: solid;
  outline-color: hsl(0, 0%, 73%); /* grey */
}
</style>
</head>
<body>
<h2>The outline-color Property</h2>
<p>The color of the outline can also be specified using HSL values:</p>
<p class="ex1">A solid red outline.</p>
<p class="ex2">A dotted blue outline.</p>
<p class="ex3">A solid grey outline.</p>
</body>
</html>

Result:

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.

The following example shows some outlines specified with the shorthand outline property:

<!DOCTYPE html>
<html>
<head>
<style>
p.ex1 {outline: dashed;}
p.ex2 {outline: dotted red;}
p.ex3 {outline: 5px solid yellow;}
p.ex4 {outline: thick ridge pink;}
</style>
</head>
<body>
<h2>The outline Property</h2>
<p class="ex1">A dashed outline.</p>
<p class="ex2">A dotted red outline.</p>
<p class="ex3">A 5px solid yellow outline.</p>
<p class="ex4">A thick ridge pink outline.</p>
</body>
</html>

Result:

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.

The following example specifies an outline 15px outside the border edge:

<!DOCTYPE html>
<html>
<head>
<style>
p {
  margin: 30px;
  border: 1px solid black;
  outline: 1px solid red;
  outline-offset: 15px;
}
</style>
</head>
<body>
<h2>The outline-offset Property</h2>
<p>This paragraph has an outline 15px outside the border edge.</p>
</body>
</html>

Result:

The following example shows that the space between an element and its outline is transparent:

Example

<!DOCTYPE html>
<html>
<head>
<style>
p {
  margin: 30px;
  background:yellow;
  border: 1px solid black;
  outline: 1px solid red;
  outline-offset: 15px;
}
</style>
</head>
<body>
<h2>The outline-offset Property</h2>
<p>This paragraph has an outline of 15px outside the border edge.</p>
</body>
</html>

Result:

Category: CSS

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