body { background: #f4f4f9; font-family: 'Segoe UI', sans-serif; color: #333; display: flex; justify-content: center; padding: 20px; }
.container { max-width: 800px; width: 100%; }
h1 { text-align: center; margin-bottom: 20px; }
#grid { display: grid; margin: auto; gap: 2px; background: #333; padding: 2px; }
.cell {
  width: 40px; height: 40px;
  background: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}
.cell input {
  width: 100%; height: 100%; border: none; text-transform: uppercase; font-size: 1rem; text-align: center;
}
.cell.block { background: #333; }
.cell .label {
  position: absolute; top: 2px; left: 2px; font-size: 0.6rem; color: #555;
}
#clues { display: flex; justify-content: space-between; margin-top: 20px; }
#clues h2 { margin-bottom: 5px; }
#clues ul { list-style: none; padding: 0; }
#submission { margin-top: 20px; display: flex; gap: 10px; }
#submission input { flex: 1; padding: 8px; font-size: 1rem; }
#submission button { padding: 8px 16px; font-size: 1rem; cursor: pointer; }
#message { margin-top: 10px; font-weight: bold; }
```css
body { background: #f4f4f9; font-family: 'Segoe UI', sans-serif; color: #333; display: flex; justify-content: center; padding: 20px; }
.container { max-width: 800px; width: 100%; }
h1 { text-align: center; margin-bottom: 20px; }
#grid { display: grid; margin: auto; }
.cell {
  width: 40px; height: 40px;
  border: 1px solid #999;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}
.cell input {
  width: 100%; height: 100%; border: none; text-transform: uppercase; font-size: 1rem; text-align: center;
}
.cell.block { background: #333; }
.cell .label {
  position: absolute; top: 2px; left: 2px; font-size: 0.6rem; color: #555;
}
#clues { display: flex; justify-content: space-between; margin-top: 20px; }
#clues h2 { margin-bottom: 5px; }
#clues ul { list-style: none; padding: 0; }
#submission { margin-top: 20px; display: flex; gap: 10px; }
#submission input { flex: 1; padding: 8px; font-size: 1rem; }
#submission button { padding: 8px 16px; font-size: 1rem; cursor: pointer; }
#message { margin-top: 10px; font-weight: bold;