Correct 3 column shortcode CSS

This is going to be a very easy job, it should take you 10-20 mins at most for a skilled programmer, THE BUDGET FOR THIS PROJECT IS $30 IF YOU CAN'T DO IT FOR THAT AMOUNT PLEASE DON'T BID ON IT I have a wordpress theme on a WP site, and my 3 column shortcode is not acknowledging the changes I have made to the container on the site (changed width from original [login to view URL] file) I need changes to be delivered in a day. This is the link of what my site is currently doing. [login to view URL] As you can see the column layout stays on the left, and in less than half the width. I checked the [login to view URL] file and the dimensions are represented in percentage, yet they do not display so. Eventually what I want is for this 5 pictures to be displayed like the image I am attaching. ideally it will be done by correcting the shortcode but it can be done in any other way, so long as I can have the option to change it later on the wisiwig and not have to post another gig here. Thank you. Looking forward to doing business with you. David C.