I have set my home page to be my portfolio displayed in masonry style. Since I have recently started to work on my SEO, my SEO plugin is asking me to add page descriptions and other info, but must also be included as content on the actual page. 

So I was looking to add a brief description that fits responsively in the blank/empty space that is left at the bottom of my portfolio (the width depends on the resizing of the browser window). 

See attachment to see what I mean with "blank space".

How could I achieve this without creating a clickable portfolio item?