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CSS | box-sizing Property
  • Difficulty Level : Basic
  • Last Updated : 08 Aug, 2019
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The box-sizing CSS property defines how the user should calculate the total width and height of an element i.e padding and borders, are to be included or not.

Syntax:

box-sizing: content-box|border-box;

Property Values:

  • content-box: This is the default value of box-sizing property. In this mode the width and height properties includes only the content. Border and padding are not included in it i.e if we set an element’s width to 200 pixels, then the element’s content box will be 200 pixels wide, and the width of any border or padding will be added to the final rendered width.
    Syntax:
    box-sizing: content-box;

    Example:






    <!DOCTYPE html>
    <html>
        <head>
            <title>box-sizing Property</title>
            <style
                div {
                    width: 200px;
                    height: 60px;
                    padding: 20px;
                    border: 2px solid green;
                    background: green;
                    color: white;
                }
                .content-box { 
                    box-sizing: content-box; 
                }
            </style>
        </head>
        <body style = "text-align: center;">
            <h2>box-sizing: content-box</h2>
            <br>
            <div class="content-box">GeeksforGeeks</div>
        </body>
    </html>

    Output:
    content-box

  • border-box: In this mode the width and height properties includes content, padding and borders i.e if we set an element’s width to 200 pixels, that 200 pixels will include any border or padding we added, and the content box will shrink to absorb that extra width. This typically makes it much easier to size elements.

    Syntax:

    box-sizing: border-box;

    Example:




    <!DOCTYPE html>
    <html>
        <head>
            <title>box-sizing Property</title>
            <style
                div {
                    width: 200px;
                    height: 60px;
                    padding: 20px;
                    border: 2px solid green;
                    background: green;
                    color: white;
                }
                .border-box { 
                    box-sizing: content-box; 
                }
            </style>
        </head>
        <body style = "text-align: center;">
            <h2>box-sizing: border-box</h2>
            <br>
            <div class="border-box">GeeksforGeeks</div>
        </body>
    </html>

    Output:
    border-box

Supported Browsers: The browser supported by box-sizing property are listed below:

  • Google Chrome 10.0 4.0 -webkit-
  • Internet Explorer 8.0
  • Firefox 29.0 2.0 -moz-
  • Opera 9.5
  • Apple Safari 5.1 3.2 -webkit-

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