Words splitting into two lines, not staying whole

Hi there,

On mobile (only mobile), the words of my posts are being split into two at the end of the line, to the next line, instead of staying whole.

I have seen this post on here previously which I think dealt with the same issue but entering this CSS doesn’t work: https://wordpress.org/support/topic/split-words-on-two-lines-1?replies=6

Any ideas? Currently articles look great on tablet and desktop but un-readable on an iPhone!

Thanks