Style <select multiple="multiple"> elements

[rotsee]

When using the multiple attribute with a element, the arrow to the right should probably be hidden. Additionally: The label text should probably be positioned above the content, so that it is not overlaid when scrolling. (There might be a few other tweaks as well) edit: image embedding seems broken, but here's an example of the current behaviour: https://user-images.githubusercontent.com/122874/73550240-864ed680-4444-11ea-83a9-b0c70de96807.png (Chrome)