[nerbert]

in postbit.css find line 256, about a quarter down and modify as shown

.postcontent {
	word-wrap: break-word;
	text-align:justify;
}


.postbit .posttitle {
	display:block;
	padding: {vb:stylevar padding};
	font-weight:bold;
	font: {vb:stylevar post_title_font};
	margin: 0;
}

.postbit .content img, .postbitlegacy .content img, .postbitdeleted .content img, .postbitignored .content img, .eventbit .content img {
	max-width: {vb:stylevar image_medium_max};
}

/*postbit legacy*/

I don't know if this works for the legacy version. Test it out and see how it works with center tags.

Generally it seems to work nicely as long as the user hasn't used carriage return