I've set up my homepage to display news articles based on the Masonry template. Due to the space available, Masonry renders three columns in standard browser view (four wouldn't fit). However, the space available would support the Masonry columns to be wider. As it is there is a lot of white space. You can see what I mean here:
http://www.ratingaction.com/index.php/de/
How can I set the Masonry template to make use of the available space, please?