materio-base-d7/themes/seven/ie7.css

ul.tabs.primary {
  padding: 0;
}
ul.primary li,
ul.primary li a,
ul.primary li.active a {
  float: none !important;
  display: inline;
}
ul.primary li,
ul.primary li a,
ul.primary li a.active,
ul.primary li a:active,
ul.primary li a:visited,
ul.primary li a:hover,
ul.primary li.active a {
  zoom: 1;
  position: relative;
}
ul.admin-list li {
  position: static;
}