* { -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; }
From wikipedia:
Web designer Doug Bowman has said that the original Internet Explorer box model represents a better, more logical approach.[18] Peter-Paul Koch gives the example of a physical box, whose dimensions always refer to the box itself, including potential padding, but never its content.[10] He says that this box model is more useful for graphic designers, who create designs based on the visible width of boxes rather than the width of their content.[19] Bernie Zimmermann says that the Internet Explorer box model is closer to the definition of cell dimensions and padding used in the HTML table model.[20]The W3C has included a "box-sizing" property in CSS3. Whenbox-sizing: border-box;
is specified for an element, any padding or border of the element is drawn inside the specified width and height, "as commonly implemented by legacy HTML user agents".[21] Internet Explorer 8, Opera 7.0 and later, and Konqueror 3.3.2 and later support the CSS3 box-sizing property. Gecko-based browsers such as Mozilla Firefox support the same functionality using a proprietary "-moz-box-sizing" property,[22] and WebKit browsers such as Apple Safari and Google Chrome support it as a proprietary "-webkit-box-sizing" property.[23]