I'm wondering why the div container (background-box-2) is not transparent. In my opinion it should be transparent. If you are scrolling you should have a look at the fixed background image. What is my mistake? Thanks :) 

```css
.background-box {
  height: 1000px;
  width: 100%;
  background-image: url(http://images.car.bauercdn.com/pagefiles/72609/mclaren-720s-01.jpg);
  background-repeat: no-repeat;
  background-attachment: fixed;
}

.background-box-2 {
  width: 100%;
  height: 250px;
  background: rgba(255, 255, 255, 0.8);
}
```

```html
<div class="background-box">
</div>
<p>
  Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata
  sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum.
  S
</p>
<div class="background-box-2">
</div>
<p>
  Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata
  sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum.
  S
</p>
```