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With HTML/CSS, how can I make an element that has a width and/or height that is 100% of it's parent element and still has proper padding or margins?
By "proper" I mean that if my parent element is 200px tall and I specify height = 100% with padding = 5px I would expect that I should get a 190px high element with border = 5px on all sides, nicely centered in the parent element.
Now, I know that that's not how the standard box model specifies it should work (although I'd like to know why, exactly...), so the obvious answer doesn't work:
#myDiv { width: 100% height: 100%; padding: 5px; } But it would seem to me that there must be SOME way of reliably producing this effect for a parent of arbitrary size. Does anyone know of a way of accomplishing this (seemingly simple) task?
Oh, and for the record I'm not terribly interested in IE compatibility so that should (hopefully) make things a bit easier.
EDIT: Since an example was asked for, here's the simplest one I can think of:
<html style="height: 100%"> <body style="height: 100%"> <div style="background-color: black; height: 100%; padding: 25px"></div> </body> </html> The challenge is then to get the black box to show up with a 25 pixel padding on all edges without the page growing big enough to require scrollbars.
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height:100vh The . box class has only 100vh which is 100% of the viewport height. When you set the height to 100vh, the box element will stretch its height to the full height of the viewport regardless of its parent height.
The width and height properties include the content, but does not include the padding, border, or margin.
The specified width and height of an element do not include padding and border. The specified width and height (and respective min-width , min-height and max-width , max-height properties) on this element determine the padding box of the element.
I learned how to do these sort of things reading "PRO HTML and CSS Design Patterns". The display:block is the default display value for the div, but I like to make it explicit. The container has to be the right type; position attribute is fixed, relative, or absolute.
.stretchedToMargin { display: block; position:absolute; height:auto; bottom:0; top:0; left:0; right:0; margin-top:20px; margin-bottom:20px; margin-right:80px; margin-left:80px; background-color: green; }<div class="stretchedToMargin"> Hello, world </div>Fiddle by Nooshu's comment
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