Tailwind CSS Box Sizing Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report The CSS box-sizing property controls how an element's width and height are calculated, including padding and borders. Tailwind CSS simplifies managing box-sizing for consistent layouts.Use utilities like box-border to include borders and padding in the element's size.Use box-content to exclude borders and padding, calculating only the content size. HTML <html> <head> <script src="https://cdn.tailwindcss.com/3.4.16"></script> </head> <body> <div class="box box-border border-4 p-4 bg-blue-200"> Box with padding and border included in size </div> <div class="box box-content border-4 p-4 bg-green-200"> Box with size excluding padding and border </div> </body> </html> box-border: Includes borders and padding in the element's total width and height.box-content: Excludes borders and padding, calculating size only for the content area.Box Sizing Classesbox-border box-content Tailwind CSS box-border ClassThe box-border class ensures that the element's width and height include its content, padding, and borders, making it easier to size elements.Syntax:<element class="box-border">..</element> HTML <html> <head> <link href="https://unpkg.com/[email protected]/dist/tailwind.min.css" rel="stylesheet"> </head> <body class="text-center"> <div class="box-border m-auto h-28 w-32 p-4 border-4 bg-green-500 m4"> A Computer Science Portal </div> </body> </html> The box-border class includes the border and padding within the element’s total width and height, simplifying layout adjustments.Tailwind CSS box-content ClassIn this mode, the width and height class include 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:<element class="box-content">..</element>Example: HTML <html> <head> <link href="https://unpkg.com/[email protected]/dist/tailwind.min.css" rel="stylesheet"> </head> <body class="text-center"> <div class="box-content m-auto h-28 w-32 p-4 border-4 bg-green-500"> A Computer Science Portal </div> </body> </html> The box-content class ensures that the specified width and height apply only to the content area.Padding (p-4) and border (border-4) are added outside the content dimensions, increasing the element's total rendered size.Best Practices for Using Tailwind CSS Box SizingUnderstand the Defaults: Use box-border as it’s the default and simplifies layout calculations by including padding and borders in the element’s size.Use box-content When Needed: Switch to box-content for specific cases where only the content size matters, like when adding extra spacing outside the box.Combine with Spacing Utilities: Leverage Tailwind’s margin and padding utilities for better control over spacing and layout. 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