Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

CSS Responsive Layouts Media Queries Media Query Review

4,491 Points

box-sizing: inherit;

what does box-sizing: inherit; do?

1 Answer

Jamie Reardon
.a{fill-rule:evenodd;}techdegree seal-36
Jamie Reardon
Treehouse Project Reviewer

Hi, the box-sizing property alters the way the browser calculates the total width and height of an element. By default, when you set any padding/border values on an element after defining a specific width, the total width of that element would expand, making it bigger than what you may prefer.

So the value border-box alters that, and any borders/padding values get added up inside of the element's width instead of expanding it.

It's usually good practice to add box-sizing: border-box to the universal selector (*) when starting your CSS file so its out of the way and all elements get that.

The value inherit what you see here basically tells the element to inherit the value for the border-box property (border-box) from the above parent.

You will come across sites that will use the html tag in css and apply the border-box property within that selector, then use the universal selector to inherit that value.