Module:IPA/styles.css

.IPA {
  font-family: serif;
}

.IPA-label-small {
    font-size: 85%;
}

/* Don't shrink the label where text is already small, per MOS:SMALLTEXT */
.references .IPA-label-small,
.infobox .IPA-label-small,
.navbox .IPA-label-small {
    font-size: 100%;
}