MediaWiki:Common.css

/* CSS placed here will be applied to all skins */
#all-reports > ul {
  list-style-type: none;
  columns: 3;
}

#all-reports > ul > li {
  text-align: center;
  padding: 2px;
  border: 2px solid gray;
  border-radius: 5px;
  font-size: 20px;
}

a.external:after {
	display: none !important;
}