I think he is actually wondering how to make it so that the content can be different heights but still fill the space ie a masonry layout:
One example:
http://forum.webflow.com/t/dynamic-list-masonry-style-layout/20334/2
This may also help:
http://forum.webflow.com/t/masonry-tutorial-please/18834
Here is an example site using isotope
http://isotopelearning.webflow.io/
Other plugins: Nested, Mason.js, Cube Portfolio, Megafolio, Gridalicious, Woomark, Smart content placer, Freetile etc etc.
Here is an example using only css: