Invalid calculated width value in KVM component

[sparkiegeek]

Describe the bug
DevTools console shows invalid width value

maas-ui version
2.0.1 (2be637f).

MAAS version
MAAS version: 2.9.1 (9153-g.66318f531)

To Reproduce
Steps to reproduce the behaviour:

1. Go to '/r/machines'
2. Open Web Console in DevTools
3. See error

Error in parsing value for 'width'. Declaration dropped.

Expected behaviour
No error

Desktop (please complete the following information):

• OS: Ubuntu 20.04 LTS
• Browser: Firefox
• Version: 84.0.2

Additional context
I can't speak SCSS but it certainly looks like bad syntax in

https://github.com/canonical-web-and-design/maas-ui/blob/349bba46b22a0a87bb5c5cbd9fab7de883cef63b/ui/src/app/kvm/components/KVMActionFormWrapper/ComposeForm/InterfacesTable/SubnetSelect/_index.scss#L72