/* Keep diagram text legible; narrow screens scroll within the figure. */
figure.flow-diagram, .figure.flow-diagram {
    overflow-x: auto;
    max-width: 100%;
    margin: 1.5rem 0;
}
.flow-diagram img {
    width: 660px;
    min-width: 520px;
    max-width: 100%;
    height: auto;
}