Shortcode to display 3 column grid

At the bottom of my blog posts I like to display certain category listings that relate to the blog article. I am using the below shortcode but would like to amend so that it displays 3 columns instead of 4. Can anyone advise what I need to add to the shortcode?

[LISTINGS cat=’656′ orderby=’ID&order’ order=’desc’ show=20 grid=true]

Sample page here https://weddingswhitsundays.com.au/tropical-summer-weddings-in-the-whitsundays/