How to make featured image overflow the content area in homepage

Hi all, first let me say how much I love the theme, I am in the process of customising it to my needs and so far so good.

One thing I am trying to do is have the posts featured image that is displayed on the homepage for each post flow over the edge of the post content area, an example of this can be found on the RNCC website https://www.nrcc.org

my site can be found here https://www.politicalticker.co.uk/ if the community could help me out on this that would be great.

Thanks in advance.