Outline

CSS Style

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DEMO
{
    outline: 10px double #1c87c9;
     outline-offset: 0px;
}
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CSS Outline Maker

An outline is a line that is drawn outside the borders. An outline and a border are similar but there are many differences. If you can make borders rounded with the help of the border-radius property, the outline property cannot make borders rounded.

This tool allows you to set the thickness, select a style, give color, and specify the space between an outline and the edge or border of an element.