Help About Span Tags Margins

hi you know cs-cart build spans for grids. span1,span2 ..etc

cs-cart put calculated margin-left them almost %2.5 its huge for me i check grid.less but i cant decrease this to %1 any can help me for that calculation ?

it is calculated here

design/themes/THEME/css/tygh/mixins.less

You can override default styles in the Theme editor