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# set padding as percent value: the percentage is relative to the width of the box? But what's the width of the box?

I guess the width is just the content's width, not the box's width?

in the video, Guil said total width of the container, so that's equal : content + 2*padding + 2*border, but how you set padding's percentage value when the equation has padding?

## 1 Answer

The width of the box doesn't really matter. The box could be a set width (500px) or a percentage width: (46%). When they say to set the padding to a percentage of the width, the padding will be x% of whatever the width of box is. So, if you set the padding at 5% and the box is a 500px width, then the padding will be 25px. But, if the width box is a percentage of 46%, then 5% will calculate based off that...so, if the browser is resized, the width of the box is resized automatically, and so will the padding.

thanks, that make sense

actually I find the percentage is relative to the box's containing elements.