# Width aspect <main> and <aside>

**URL:** https://discourse.roots.io/t/width-aspect-main-and-aside/4724
**Category:** sage
**Created:** 2015-09-10T12:40:23Z
**Posts:** 2

## Post 1 by @max_grundell — 2015-09-10T12:40:23Z

Hello,

As of now the grid system of the sage has width: 66.666666% and the aside has 33.333333%.

My question is simple, i want to change this to 72% / 28%. How do i achive this ?

Best.

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## Post 2 by @Foxaii — 2015-09-10T15:19:33Z

You will need to change the number of columns in Bootstrap per: [http://getbootstrap.com/css/#grid-less](http://getbootstrap.com/css/#grid-less)

Some quick maths finds that 72 and 28 share a highest common factor of 4. So to calculate the columns needed we do `(72/4) + (28/4) = 25`

Therefore 25 columns are needed in total, 18 (72/4) for the main and 7 (28/4) for the aside.