Styling the img.
img.post {
padding: 6px;
border: none;
display:block;
margin-left:auto;
margin-right:auto;
}
<img class="post" src="image.jpg" />
Using a div with the ID of "post".
#post img {
padding: 6px;
border: none;
display:block;
margin-left:auto;
margin-right:auto;
}
<div id="post">
<img src="image.jpg" />
</div>
Using Text-align:center to center the div.
.ctr { text-align:center;}
.img1 {border:none; width:450px; margin:10px;}
<div class="ctr">
<img class="img1" src="images/photos/2004-6-5 00037.jpg" alt="The Origional Gang" />
</div>
♠ ♣ ♥ ♦