.rich-text img.left {
    float: left;
    margin: 15px 15px 15px 0;
}

.rich-text img.right {
    float: right;
    margin: 15px 0 15px 15px;
}

.rich-text img.full-width {
    width: 100%;
    height: auto;
    margin: 15px 0 15px 0;
}