What are the limitations of using CSS to modify the visual aspects of checkboxes in PHP?

When using CSS to modify the visual aspects of checkboxes in PHP, there are limitations in terms of customizing the appearance of checkboxes beyond basic styling such as color and size. To overcome this limitation and have more control over the visual aspects of checkboxes, you can use custom checkbox styles created with HTML and CSS.

<input type="checkbox" id="custom-checkbox" name="custom-checkbox">
<label for="custom-checkbox" class="custom-checkbox-label"></label>
```

```css
.custom-checkbox-label {
  display: inline-block;
  width: 20px;
  height: 20px;
  background-color: #fff;
  border: 1px solid #ccc;
}

.custom-checkbox-label:hover {
  background-color: #f0f0f0;
}

input[type="checkbox"] {
  display: none;
}

input[type="checkbox"]:checked + .custom-checkbox-label {
  background-color: #007bff;
  border-color: #007bff;
}