MediaWiki:Common.css

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<style>
.infobox th {
    text-align: center !important;  /* centers all headers */
}
.infobox td {
    text-align: left !important;    /* keeps data left-aligned */
}
.infobox .infobox-above {
    text-align: center !important;  /* for rows like “Incumbent” or top rows */
}
</style>