Column feature image – Centred

I have tried following css

`text-align: -moz-center;
text-align: -webkit-center;`

in

@media (min-width: 768px)
.hentry.post-grid-2-col

you add these text-align properties in your custom.css

In your child theme css you can you can adjust the class .hentry.post-grid-2-col

and text-align center for cross browser css

if you need some help in creating child theme this might work for you
https://codex.ww.wp.xz.cn/Child_Themes