.left {
  position: sticky;
  top: 0;
  left: 0;
  height: 100vh;
  transition: width 0.2s ease;
  overflow: hidden;
}
.right {
  position: sticky;
  top: 0;
  left: 0;
  height: 100vh;
  transition: width 0.2s ease;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: baseline;
  align-items: baseline;
  overflow-y: auto;
}
.open {
  width: 250px;
}

.closed {
  width: 0;
  height: 0;
}