How to Add Border To Blogger/ Blogs Content
Border Adding in Blogs Posts
Here's another tip I just figured out. I wanted a black border around all of my blog content at Cozy Little House.
Go to Design>Edit HTML (may want to backup your blog first).
Somewhere on the white of the page, click CTRL and F. In the box, type .content-outer;
Just under that, type:
border: 5px solid #000000;
You can use whatever hex color you want. I wanted black, and that is #000000. And you can make the thickness any size you want. I wanted 5px and solid. You could also use dashed or dotted.
Then I went to Customize and merely chose a green color for my background. I love how the green looks up next to the black border.
That's it!