body, html {
  margin: 0;
  padding: 0;
  height: 100%;
}

tr .handle {
  width: 10px;
  background-color: #7a7a7a;
  cursor: move;
}

.lyt-container {
  display: grid;
  grid-template-areas: "header header" "nav main";
  grid-template-columns: 150px auto;
  grid-template-rows: auto 1fr;
  /* NEW */
  min-height: 100vh;
}

header {
  grid-area: header;
  border-bottom: 1px solid #999999;
  padding: 0.5rem;
}

nav {
  grid-area: nav;
  border-right: 1px solid #999999;
  padding: 0.5rem;
}

main {
  grid-area: main;
  padding: 0.5rem;
}

#app {
  min-height: 100%;
}