adding space between image and text in style.css

I’m trying to find the correct coding to add to my style.css so that there is a 10px padding or margin around all sides of the image.
Can anyone please help. Also where in the coding should I place it.

Heres the first part of my style.css

[please mark any code according to the forum guidelines for posting code – or even better post a link to your site]

/*
Theme Name: This Just In!
Theme URI: http://wphackr.com/themes/this-just-in/
Description: Compatable with WordPress version 2.7 and higher. A clean, optimized with enhanced archives and a large header image, designed for professional and/or photography blogs. This version adds support for threaded comments and sticky posts.
Version: 3.4
Author: John Crenshaw
Author URI: http://wphackr.com
Tags: black, white, fixed-width, two-columns, threaded-comments, sticky-post, right-sidebar

	This Just In!
	 http://wphackr.com/

	This theme was designed and built by John Crenshaw at WordPress Hacker.
	For tips on customizing WordPress, visit http://wphackr.com

	The CSS, XHTML and design is released under GPL:
	http://www.opensource.org/licenses/gpl-license.php

*/
body {
	font-size: 62.5%; /*Set font size so 1em = 10px*/
	background: #333;
	color: #333;
	margin: 20px 0;
	text-align: center; /*Center site on page in IE*/
	font-family: verdana, arial, tahoma, serif;
}
div img { padding: 10px 10px;
margin: 10px 10px;
border: 10px 10px;
}

a,
a.link,
a.visited {
	color: #446592;
	text-decoration: underline;
}
a:hover,
a:active {
	color: #6699CC;
	}
a:hover img,
a:active img,
a img:hover,
a img:active,
a.img:hover,
a.img:active {
	background: transparent;
	}

h1 a.standard {
	color: #446592 !important;
	background: transparent !important;
	text-decoration: none;
	font-weight: bold;
	}
h1 a.standard:hover {
	color: #446592 !important;
	background: transparent !important;
	text-decoration: none;
}
h1 a, h2 a {
	text-decoration: none;
	color: #000;
}
h1 a:hover, h2 a:hover {
	color: #446592;
}
h1.pagetitle { /* For title of categories, archives, and tags pages */
	border-bottom: 1px dotted #CCC;
	margin-bottom: 15px;
	display: inline;
	font-style: italic;
}
h3.pagetitle { /* For ...now browsing by "" for categories, archives, and tags pages */
	display: inline;
	color: #990000;
	font-style: italic;
}
h3.archives {
	margin-top: 10px;
	margin-bottom: 10px;
}
h3.archive_head {
	font-size: 1.8em;
	color: #000;
}
h3.archives a {
	text-decoration: none;
}
h3.archives a.permalink {
	border-bottom: 1px dotted #CCC;
}