MediaWiki:Common.css

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<style>
/* Center headers like "Incumbent" */
.infobox .infobox-above {
    text-align: center !important;
}

/* Center table headers */
.infobox th {
    text-align: center !important;
}

/* Keep table data left-aligned */
.infobox td {
    text-align: left !important;
}
</style>