How Can I Make Div Borders Consistent Using CSS?

Achieving Consistent Div Borders

When styling div elements with a border, the standard CSS approach (e.g., "border: 1px solid black") adds the border thickness to the div's size. For example, a 1px border would result in a div that measures 102px x 102px instead of the intended 100px x 100px.

Leveraging the "box-sizing" Property

To rectify this issue, CSS introduced the "box-sizing" property. By setting this property to "border-box," the browser will treat the border width as part of the div's dimensions.

Implementation in Code

Consider the following code:

div {
    box-sizing: border-box;
    width: 100px;
    height: 100px;
    border: 20px solid #f00;
    background: #00f;
    margin: 10px;
}

By specifying "box-sizing: border-box," the div now measures 100px x 100px, with the 20px border included within those dimensions.

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