CSS OUTLINE-STYLE

The ‘outline-style’ property specifies an outline line style for the current element.

The outline properties create a uniform line around an object in order to draw visual attention. An outline is slightly different than a border in several ways: An outline is drawn starting “just outside the border edge” and is allowed to be non-rectangular. Outlines are always rendered on TOP of an element’s rendering box and do not influence the box’s position or size calculation; the document does not need to be re-flowed when a border is rendered or hidden, but the outline may overlap other nearby elements.

Example
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button {
  outline-style: ridge
}
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<button style="outline-style: groove">Press Me!</button>

Possible Values

inherit: Explicitly sets the value of this property to that of the parent
none: No outline is rendered. This overrides any value of ‘outline-width’, if present
dotted: The outline is rendered as a series of dots
dashed: The outline is rendered as a series of short lines
solid: Renders a solid line for the outline

groove: Creates the effect of the outline being grooved or carved in the rendering surface (A 3-D groove – the opposite of ‘ridge’.) The groove bevel color is rendered based upon the value of the ‘color’ property

ridge: Creates the effect of the outline being raised from the rendering surface (A 3-D ridge – the opposite of ‘groove’.) The ridge bevel color is rendered based upon the value of the ‘color’ property

inset: Creates the effect of the outline being embedded in the rendering surface (A 3-D inset.) The inset bevel color is rendered based upon the value of the ‘color’ property. A distinction exists between this value and ‘groove’

outset: Creates the effect of the outline coming out of the rendering surface (A 3-D outset – the opposite of ‘inset’.) The outset bevel color is rendered based upon the value of the ‘color’ property. A distinction exists between this value and ‘ridge’

double: A double line outline is drawn on top of the element. The two lines with the space between adds up to the value of the ‘outline-width’ property