How to have an inner DIV width go outside the padding of the outer DIV?

<div style="padding:20xp;width:100%;"
    <div style="width开发者_运维知识库:?????">

    <div>
</div>

I would like the inner div to fill the screen completely, even when the outer div has 20px padding. How can that be done? thanks.

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Give the inner <div> a negative margin to negate the padding and fill the width, example:

<div style="padding:20px;">
    <div style="margin: -20px;">
      Content Here
    <div>
</div>