How do I add a sidebar to my content?

[wost]

I’m very happy with my webpage as it is, but I can’t figure out how to add a sidebar to the, well, side of the main content. Can anyone give me some pointers? What should I look into to make this sidebar? I would like the .content .bigger to take appr. 75% of the #main_content, and the rest should be used for the sidebar.

Sorry if this isn’t the right place to ask this, haha. :)

EDIT: I forgot my Codepen: https://codepen.io/wostensen/pen/EvWXqO

[Beverleyh]

Here’s a good place to start learning about different layout options http://learnlayout.com/toc.html

The sections on floats and flexbox will be of particular interest to you.

[Author]

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