CSSレイアウトジェネレーター— 見た目とコードを一緒に確認

.layout {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: auto auto auto;
  gap: 16px;
  grid-template-areas:
    "header header header"
    "sidebar main main"
    "footer footer footer";
}
.area-header { grid-area: header; }
.area-sidebar { grid-area: sidebar; }
.area-main { grid-area: main; }
.area-footer { grid-area: footer; }
@media (max-width: 640px) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-rows: none;
    grid-template-areas: "header" "sidebar" "main" "footer";
  }
}