### Prompt
```
simple javascript class to display a toast. 
white text, dark green backdrop. 
display for 1 second, then close
```
### Code
```js
class Toast {
  static show(message, duration = 1000) {
    const toast = document.createElement('div');
    toast.className = 'toast';
    toast.textContent = message;
    document.body.appendChild(toast);

    // Force reflow to trigger transition
    void toast.offsetWidth;
    toast.classList.add('show');

    setTimeout(() => {
      toast.classList.remove('show');
      setTimeout(() => toast.remove(), 300); // allow fade-out transition
    }, duration);
  }
}

// Example usage:
Toast.show('Saved!')
```
```css
.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background-color: #064420; /* dark green */
  color: white;
  padding: 10px 20px;
  border-radius: 8px;
  font-family: sans-serif;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: 10000;
}
.toast.show {
  opacity: 1;
}
```