A temporary solution would be to keep targeting the post classes so that the CSS applies to certain posts. Not your whole website.
Each post on the Home page is contained in a <div>
element that has a unique class. The Audrey Middleton post has a unique class of “post-4262”. You can use that in CSS like this:
.home .post-4262 .entry p:first-of-type {
max-height: 375px;
overflow: hidden;
}
This means you can target it in CSS and not affect other posts on the Home page.
Then for any other posts that you want to target, you find out the unique class and modify your CSS to include it. For example, the next post about “Big Brother 17 Houseguests Revealed” has the unique class of “post-4081”, so you’d use this code instead:
.home .post-4262 .entry p:first-of-type,
.home .post-4081 .entry p:first-of-type {
max-height: 375px;
overflow: hidden;
}
You can find out these classes in the Chrome browser really easily, just right click on the post general area and select “Inspect element”. Then you are shown a toolbar with the emulated HTML of the page: https://snag.gy/ITMhX.jpg