Custom code to make 2nd blog page 5 posts per row with square images

Hi there, I want two set up two blog pages to have two different layouts. Could anyone share a code to make this blog page have 5 post per row with square images? https://www.pblmagazine.co.uk/launches

Thanks so much!

Need some custom code (css) to handle. Change width to 20%, remove clear both in 3n+1, set clear both for 4n+1, fix padding top of last posts in row.

Just a few notes, if I have time in the evening, I will check and send css