How do i give a banner to a corner of a wordpress publish using css or inside the publish itself. I have assaulted a screen of the items I'd want it to seem like, but I'm not sure how to make it happen.

enter image description here

Give a background image for your publish class and hang the background-position property to top right

.post {background:url('your-image.jpg') top right no-repeat}

Make sure the parent div has position: relative (or position: absolute) set, then set your banner to put: absolute right: top: