Template:InfoBox/styles.css

.infobox {
  background-color: #eaf3ff;
  color: #333;
  background-image: url(https://upload.wikimedia.org/wikipedia/commons/e/ec/OOjs_UI_icon_information-progressive.svg);
  background-size: 25px;
  border-color: #a3caff;
  padding-left: 40px;
  min-height: 25px;
}

.infobox-icon {
  width: 24px;
  height: 24px;
  margin-right: 0.8em;
  flex-shrink: 0;
}

.infobox-text {
  flex-grow: 1;
}