How Can I Add a Border to a Div Without Increasing Its Size?

Nestling Border Within a Div

To incorporate a border within a div element without extending its dimensions, utilize the box-sizing property. By default, browsers consider border and padding as part of the element's content, expanding the element's size to accommodate them. However, setting box-sizing to border-box tells the browser to include the border within the element's overall size, ensuring it remains consistent regardless of the border's width.

In your example, you can apply the following style:

div {
    box-sizing: border-box;
    width: 100px;
    height: 100px;
    border: 1px solid black;
}

With this styling, the border will be placed 1 pixel within the div's edges, without altering its overall dimensions. This resolves the issue of having to perform additional calculations to adjust for the border's width.

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