Module:Infobox/bordered/styles.css

/* Infobox bordered class template style */
.infobox.bordered {
   border-collapse: collapse;
}
.infobox.bordered td,
.infobox.bordered th {
   border: 1px solid var(--border-color-base,#a2a9b1);
}
.infobox.bordered .borderless td,
.infobox.bordered .borderless th {
   border: 0;
}

/* styles for bordered infobox with merged rows */
.infobox.bordered .mergedtoprow td,
.infobox.bordered .mergedtoprow th {
   border: 0;
   border-top: 1px solid var(--border-color-base,#a2a9b1);
   border-right: 1px solid var(--border-color-base,#a2a9b1);
}
 
.infobox.bordered .mergedrow td,
.infobox.bordered .mergedrow th {
   border: 0;
   border-right: 1px solid var(--border-color-base,#a2a9b1);
}