.aside {
  grid-area: aside;
  background-color: #f8f9fa;
  border-right: 1px solid #e9ecef;
  overflow-y: auto;
}

.head {
  grid-area: head;
  background-color: #343a40;
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 1rem;
}

.main {
  grid-area: main;
  background-color: #f8f9fa;
  overflow-y: auto;
}

.right {
  grid-area: right;
  background-color: #f8f9fa;
  border-left: 1px solid #e9ecef;
  overflow-y: auto;
}