.perf-tool .tab-manager {
  position: relative;
}

.perf-tool .tab-bar {
  position: absolute;
  top: 0; right: 0; left: 0;
  background-color: #F3F3F3;
  border-bottom: 1px solid #CCCCCC;
}

.perf-tool .tab-header {
  display: inline-block;
  padding: 0.8em;
  font-size: 12px;
  max-width: 10em; width: 100%;
  text-align: center;
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
  cursor: pointer;
  transition: all .2s ease-out;
  user-select: none;
  -webkit-user-select: none;  
}

.perf-tool .tab-header:hover {
  background-color: #e5e5e5;
  transition: all .2s ease-out;
}

.perf-tool .tab-header.left {
  float: left;
}

.perf-tool .tab-header.right {
  float: right;
}
.perf-tool .tab-header.active {
  border-bottom: 1px solid #3879D9;
}

.perf-tool .tab {
  position: absolute;
  top: 2.1em; right: 0; bottom: 0; left: 0;
  height: 100%;
}