I use `angular-material` and specifically its `<md-select/>` component.  

I would like to style it's icon:  

[![enter image description here](https://i.stack.imgur.com/g4pu1.png)](https://i.stack.imgur.com/g4pu1.png)

We used to override its css using the class `.md-select-icon` but it seems to have been the wrong approach and recently the classes have been changed to reflect they are for "private" use (`.md-select-icon` renamed to `._md-select-icon`)

Question is - How can I do a custom override of the `.md-select` icon, the right way?

Thanks!