Si la propriété box-sizing est définie comme content-box, la largeur complète sera plus que la largeur définie pour div. Et si la box-sizing: border-box est définie, padding et border seront compris dans width et height. Voyons un autre exemple avec deux boîtes bordurées définies côte à côte. Exemple If you want your final element to stretch to the edge of the container, you'll want to only apply the margin-right to the first two elements. The best way to do this would be to combine the :not and :last-of-type pseudo-classes, as can be seen in the following: input { background-color: darkgreen; border: none; color: white From thisthat.dev: "In the content box model, the content inside of element will have the same dimension as the element. In the border box model, the content's dimension has to subtract the border and padding from the element's dimension." Hello. I’m struggling to understand how the border-box value of the box-sizing property works and why it’s so embraced by the front-end community. What I know is that the border-box value relates to the width of the overall container rather than the content box. So if, say, I have an element that’s 200px wide that element should only be 200px and no wider than that. However, I The box-sizing property can be used to adjust this behavior: content-box gives you the default CSS box-sizing behavior. If you set an element's width to 100 pixels, then the element's content box will be 100 pixels wide, and the width of any border or padding will be added to the final rendered width, making the element wider than 100px. overflow: clip; clips the element’s content while overflow-clip-margin sets how far the content is allowed to display beyond the clip. Syntax overflow-clip-margin: || : When the specified offset is zero, the visual box specifies the box edge to be used as the overflow clip edge origin. If omitted, the If you need to make adjustments to the third party content you can apply box-sizing: content-box; to the widget and its descendants. This may not be trivial as form controls in particular are border-box by default, so you’ll also have to account for that. 02.01.2012: Added a section on performance. 2012.02.03: Included webkit prefixed To use .outerWidth () as a setter, pass an argument that is a number representing the outer width (CSS “content” width, plus padding and border width). And yes, this handles the box-sizing: border-box situation fine as well; it’s basically the same as setting the .css ("width") in that case. We’ve received a few reports from people who min-content is already supported by newer browsers. This works without having to specify height anymore. The flex property of the content div makes it grow to the bottom of the viewport. For 2. Long columns scrolling, change min-height: -webkit-min-content; to height: min-content.box { height: fit-content; min-height: 100%; display: flex; } Css box-sizing border-box was first used in IE Model. But Other browsers were following W3C spec, i.e. content-box. But in CSS3, we can use same border-box model. Box sizing Border-box include padding and border of an element within. For exp, if width is 300px, padding is 10px and border is 5px, then content width is 270px, but overall width 8PmCZf5.