Creating a text area that fills the available space

I want to be able to create a text area that fills an available space.

However because of the different monitor resolutions I don't think I can simple开发者_开发百科 specify a character width. Is there anyway of getting around this without having too much logic to specify different character widths for each set of monitor resolutions.

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The answer is to simple set

style="width: 100%"

instead of

cols="XX"

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<textarea style='width:100%; height:100%'>type here</textarea>