Add a border around my posts on the home page

My blog is blog.mrhoni-photography.com As you see it, I have a background color set and my home page is displaying excerpts of my recent posts. I would like to set a specific color for a border to surround each post so a person can distinguish each specific post. I would also like to play with the wide of that border. I found this that I added to the Custom CSS, but that did't add any borders. .hentry, #page { border: 1px solid #000; } .hentry.type-page { border: none; } I'm also unable to find where I set the number of posts on the home page and how I told it to make excerpts versus displaying each entire post on the home page. I do want the excerpts, but I can't figure out how I did this.