.alignleft,
img.left {
        float: left;
        margin: 0 5px 5px 0;
}

.alignright,
img.right {
        float: right;
        margin: 0 0 5px 5px;
}

.centered {
        margin-left: auto;
        margin-right: auto;
        display: block;
        padding: 8px;
}

.gravatar {
	float: left;
	margin-right: 3px;
	margin-bottom: 3px;
}

pre { font-size: 11px; border: 1px dashed grey; width: 420px; padding: 10px; overflow: hidden; }
pre:hover { width: 900px; position: relative; z-index: 2; background-color: white; }
iframe { background: inherit; }