I'm testing out changing the font size and line height

I'm testing out changing the font size and line height on post pages. I've used Chrome's Dev Tools and used the Add Rule feature. I then added:

.entry p {
line-height: 1.5;
font-size: 1.7em;
}

I can see the line-height take effect, but not the font-size change. It looks like the font-size is being pulled from #col_contentarea p, but I thought my new rule would be more specific and take precedence.

The reason I can't use #col_contentarea is that the change would impact non-WordPress pages or posts.