.panel-container {
  display: grid;
  grid-template-columns: 0em 1fr 0em;
  transition: grid-template-columns 0.3s ease;
  height: 100vh;
}


.side-panel {
  background: rgba(0, 0, 0, 0.3);
}

.left-panel {
  border-right: 1px solid #444;
}

.right-panel {
  border-left: 1px solid #444;
}

.center-panel {
  background: #222;
  color: white;
  padding: 1em;
}