Geany doesn't support SCSS out of the box (yet), and the snippet you have is 
not valid CSS.  The line that causes trouble is "wrongly" (that'a a matter of 
perspective, as it's not plain CSS) recognized as a property `&` with the value 
`not(:last-child) { margin-right: 0`.

However, you can pretty easily get really decent support following the [steps 
from the wiki page I just created](https://wiki.geany.org/config/scss) -- and 
it also answers your second question.

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