To achieve your desired layout you will first have to change the way you have nested your content div tags. First form pairs of associated div tags that have year and right class. Nest these two div tags within a div tag with class flex. Below is an example of how this must be done.
Note that this needs to done for all the associated div tags with year and right classes.
Next add the following css for the div with flex class. Also, correct the spelling of right class in the relevant div tag/s.