.side-panel {
  position: absolute;
  top: 0px;
  bottom: 0px;
  width: 22rem;
  left: 0px;
  transition: left 0.3s;
  background-color: white;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
}

.side-panel.collapsed {
  left:-22rem;
}

.arrow {
  position: absolute;
  top: 1rem;
  left: 100%;  
  background-color: inherit;
  cursor:pointer;
}

.arrow i {
  transition: transform 0.3s;
}

.collapsed .arrow i {
  -webkit-transform: rotate(180deg);
  transform: rotate(180deg);
}

.side-panel.hidden {
  left: -24rem;
}

.content {
  height:100%;
  width:100%;
  overflow:hidden;
  overflow-y:auto;
}