Default styling for WordPress image alignment and captions

wp-img-defaults.css

/*
 * Default WP Alignment Classes
 *****************************************************************************/

.aligncenter,.alignleft,.alignright {
    display: block;
    padding: 0;
}

.aligncenter {
    float: none;
    margin: .5em auto 1em;
}

.alignright {
    float: right;
    margin: .5em 0 1em 1em;
}

.alignleft {
    float: left;
    margin: .5em 1em 1em 0;
}

.wp-caption {
    padding: 5px 0;
    border: 1px solid #555;
    background: #444;
    text-align: center;
}

.wp-caption img {
    display: inline;
}

.wp-caption p.wp-caption-text {
    margin: 5px 0 0;
    padding: 0;
    text-align: center;
    font-size: 75%;
    font-weight: 100;
    font-style: italic;
    color: #ddd;
}