Image Overlaps Bottom Border?

https://www.superiorsoundco.com/wordpress/

How can I make sure any post images don’t overlap the bottom border?

Also any other CSS aligning tips you may have would be great …

CSS:

/*Wordpress Styles*/
img.alignright {
padding: 4px;
margin: 0 0 2px 7px;
float: right;
display: inline;
}
img.alignleft {
padding: 4px;
margin: 0 7px 2px 0;
float: left;
display: inline;
}