pulsar/static/tabs.css

.tabs {
  font: caption;
  margin-bottom: 1px;
}

.tab {
  cursor: default;
  padding: 2px 21px 2px 9px;
}

.tab.file-modified .close-icon {
  border-radius: 10px;
}

.tab.file-modified .close-icon:before {
  content: "";
}

.tab.active:before,
.tab.active:after {
  position: absolute;
  bottom: -1px;
  width: 4px;
  height: 4px;
  content: " ";
  z-index: 3;
}

.tab.active:before {
  left: -4px;
}

.tab.active:after {
  right: -4px;
  border-width: 0 0 1px 1px;
}

.tab.active:first-child:before {
  display: none;
}

.tab .file-name {
  font-size: 11px;
  text-shadow: 0 -1px 1px black;
}

.tab .close-icon {
  font-family: 'Octicons Regular';
  font-size: 14px;
  width: 14px;
  height: 14px;
  display: block;
  cursor: pointer;
  position: absolute;
  right: 4px;
  top: -1px;
  -webkit-font-smoothing: antialiased;
}

.tab .close-icon:before {
  content: "\f081";
}

.tab .close-icon:hover {
  color: white;
}