MediaWiki:Common.css

/* CSS placed here will be applied to all skins */
.mw-body {
  line-height: 17px !important;
  width: 480px;
}

.toc {
  line-height: 17px !important;
}

p {
  line-height: 17px !important;
}

table {
  line-height: 17px !important;
}

h3, p {
       margin: 0;
    }