The docs read to pass in any horizontal value with an example "bottom", but the function is requiring a vertical alignment (so 'bottom' would work but 'left, center, right' would not.)
Referencing https://github.com/zurb/foundation-sites/blob/develop/scss/util/_flex.scss#L55
}
```
-For child-level alignment, use `flex-align-self()`. You can pass in any horizontal alignment.
+For child-level alignment, use `flex-align-self()`. You can pass in any vertical alignment.
```scss
.sidebar {