.sidenav {
  position: fixed;
  width: 300px;
  left: 0;
  top: 0;
  margin: 0;
  -webkit-transform: translateX(-100%);
          transform: translateX(-100%);
  height: 100%;
  height: calc(100% + 60px);
  height: -moz-calc(100%);
  padding-bottom: 60px;
  background-color: #fff;
  z-index: 999;
  overflow-y: auto;
  will-change: transform;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  -webkit-transform: translateX(-105%);
          transform: translateX(-105%);
}
.sidenav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  opacity: 0;
  height: 120vh;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 997;
  display: none;
}