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html - How to make an element width: 100% minus padding?

I have an html input.

The input has padding: 5px 10px; I want it to be 100% of the parent div's width(which is fluid).

However using width: 100%; causes the input to be 100% + 20px how can I get around this?

Example

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box-sizing: border-box is a quick, easy way to fix it:

This will work in all modern browsers, and IE8+.

Here's a demo: http://jsfiddle.net/thirtydot/QkmSk/301/

.content {
    width: 100%;
    box-sizing: border-box;
}

The browser prefixed versions (-webkit-box-sizing, etc.) are not needed in modern browsers.


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