Template:Infobox/Styles.css

/* The caption element is usually aligned to the left in the mobile skin, but this makes inconsistent with
the desktop skin (Vector) while the element is used in infobox, this fixes that. */ 
.mw-parser-output .infobox td {
    border: none !important;
}

body.skin-minerva table.infobox caption {
	text-align: center;
}
.infobox .infobox-image,
.infobox .infobox-image > div,
.infobox .infobox-caption {
  text-align: center;
}

.infobox .infobox-caption {
  font-size: 90%;
  padding: 0.2em 0;
}