Wordpress: Overide Column Width / grid size in CSS

Currently the column width is set to 300px (checked using firebug) I would like to override this size so the grid fits my site better.
1. Where/how do I adjust the size of of the grid?
2. I would override this style but it already has !important attribute and it is an inline style

.grid {
    width: 300px !important;

Thanks in advance


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