The background-clip CSS property sets whether an element's background extends underneath its border box, padding box, or content box. Try it If the element has no background-image or background-color , this property will only have a visual effect when the border has transparent regions or partially opaque regions (due to border-style or border
O box model padrão do CSS é uma das coisas mais contra-intuitivas que existem. Mas você pode trocá-lo com o box-sizing do CSS3. E, melhor, funciona em todos os navegadores -- até no IE8! Todo elemento no HTML é uma caixa. Controlamos seu tamanho com width, sua borda com border e ainda temos as margens externas e internas com margin e padding.
1. It's enough to "reset" all the paddings and the margins. However, I've seen one interesting approach, where we apply box-sizing to html. And make * *:after *:before with inheritance of box-sizing which makes it easier to work with some external components that are projected with other type of box-sizing. – Sergey.
box-sizing: border-box;} Output: As you can see, the 20px border was adjusted to the already defined height and width and not added to it. Syntax of Box-Sizing. The syntax for CSS box-sizing property is: box-sizing: content-box | border-box. The box-sizing property accepts two values: content-box and border-box. Let’s learn more about them. The best way I have seen so far of getting box-sizing working is: html { -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; } *, *::before, *::after { -webkit-box-sizing: inherit; -moz-box-sizing: inherit; box-sizing: inherit; } If your CSS reset (normalize.css) is inserted at the very top of your stylesheet Introduction to the CSS basic box model. When laying out a document, the browser's rendering engine represents each element as a rectangular box according to the standard CSS basic box model. CSS determines the size, position, and properties (color, background, border size, etc.) of these boxes. Every box is composed of four parts (or areas

More Examples. Let an image float to the right in a paragraph. Add border and margins to the image. Let an image with a caption float to the right. Let the first letter of a paragraph float to the left and style the letter. Use float to create a homepage with a navbar, header, footer, left content and main content.

Universal Box Sizing *, *:before, *:after { box-sizing: border-box; } This method selected pseudo elements as well, improving the normalizing effect of border-box. But, the * selector makes it difficult for developers to use content-box or padding-box elsewhere in the CSS. Which brings us to the current frontrunner for best practice:
2. I would suggest to use box-sixing:border-box; because it's not affecting the content of the element in connection to a usual CSS border. An inset-shadow might overlap the contents. In addition to that there's a better browser support for box-sizing:border-box like Mathias commented. Share. SzzFpg.
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    • box sizing border box vs content box