@LouisaBarrett You no longer need to prefix border-radius and box-shadow with ```-webkit``` and ```-moz```. All modern browsers have adopted these properties. http://caniuse.com/ is a great resource for checking browser support for CSS, HTML, and JS. Since this looks like Sass, you could also rely on the built-in mixins such as:

```
@include box-sizing(border-box);
```
Which will handle the browser prefixes for you.