.diagram-images {
    display: block;
    padding-top: 15px;
}
.diagram-images:after {
    display: block;
    content: '';
    clear: both;
}
.diagram-images img {
    float: left;
    width: 150px;
    height: auto;
    margin-right: 15px;
    margin-bottom: 15px;
}