How to do full width in <canvas> element?

I got full width in a <div> object, but now, the same style ( in the style attribute ) , doesn't work in a <canvas> object. How to fix it so that the right will have -8px away from the right side. So, how to do that?

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Answered by sedated [earned 5 cycles]
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why cant you just do width: calc(100% - 16px);