Keyboard controls are inverted on vertical sliders

[herrfugbaum]

Describe the bug
The keyboard controls are inverted on vertical sliders due to the rotate(90deg) style attribute.
If you change it to -90deg the indicator works as expected but now the slider flips its direction.

To Reproduce
Steps to reproduce the behavior:

1. Focus the range input
2. Use the arrow keys to navigate the slider
3. See error

Expected behavior
The slider needs appropriate keyboard support. Pressing the up arrow key ↑ should move the slider and it's indicator up, the down arrow key ↓ should do the opposite.