.nav-header {
  height: 5vh;
  line-height: 3vh;
  padding: 1vh 1vw;
  background: rgba(36,36,36,0.9);
  border-bottom: 1px solid white;
  font-weight: 700;
  text-transform: uppercase;
  color: white;
}
.nav-header-label {
  float: left;
  font-size: 1.8rem;
  font-weight: 700;
}
.nav-header-clock {
  float: right;
  margin-right: 2vw;
  /*color: rgba(0,0,0,0.5);*/
  font-size: 1.6rem;
}
.nav-header-menu {
  float: right;
}
.nav-header-history-button {
  position: relative;
  height: 3vh;
  width: 3vh;
  cursor: pointer;
}