opt-cc/static/src/app/statistic/stats.component.css

.side-bar {
  width: 20%;
  float: left;
}

.collapsed {
  width: 70px;
}

.button-container {
  position: relative;
  z-index: 100;
}

.button-container > button {
  position: fixed;
  top: calc(100vh - 35px);
  left: -10px;
  background: white;
  border: 1px solid #dadada;
}