body, html {
  margin: 0;
  height: 100%;
  font-family: Arial;
}
#container {
  display: grid;
  grid-template-columns: 1fr 1fr 4fr;
  grid-template-rows: 9fr 1fr;
  height: 100vh;
}
.panel {
  padding: 20px;
  overflow-y: auto;
}
#main-directory {
  background-color: lime;
  grid-row: 1 / 2;
}
#second-directory {
  background-color: red;
  grid-row: 1 / 2;
}
#main-display {
  background-color: #0056a0;
  color: white;
  grid-row: 1 / 2;
}
#quick-links {
  background-color: darkorange;
  grid-column: 1 / 4;
  text-align: center;
  padding: 10px;
  font-weight: bold;
}