.post-body img {
padding: 4px;
border: 1px solid #AAA;
background-color: #F0F0F0;
-webkit-border-radius: 3px;
-moz-border-radius: 3px;
border-radius: 3px;
-webkit-box-shadow: 0 15px 10px -12px black;
-moz-box-shadow: 0 15px 10px -12px black;
box-shadow: 0 15px 10px -12px black;
}
Read more: http://www.widgetgenerators.com/2012/10/add-borders-to-images-in-blogger-post.html#ixzz2hPkMOCjf>