Template:Extension/styles.css

/* Extension infobox TemplateStyles */
.ext-infobox {
  float: right;
  clear: right;
  margin: 0 0 1em 1em;
  width: 320px;

  border: 1px solid #a2a9b1;
  background: #f8f9fa;
  border-collapse: collapse;
}

.ext-infobox > caption {
  font-weight: 700;
  text-align: left;
  padding: 0.4em 0.6em;
}

.ext-infobox th,
.ext-infobox td {
  padding: 0.35em 0.6em;
  border-top: 1px solid #eaecf0;
  vertical-align: top;
}

.ext-infobox th {
  width: 38%;
  text-align: left;
  white-space: nowrap;
}