Switch :focus uses hardcoded color instead of $primary

Created by: antoinematyja

Hello,

I'm testing on macOS 10.15.3 with Chrome 81.

The new switch design uses a hardcoded color in its :focus style, which results in wrong color if the primary color was overriden.

Here is an example with $primary set to green (the switch checkbox is in :focus state):

Culprit is here:

https://github.com/twbs/bootstrap/blob/d2ed920b1537af88e85d6b28cc2461fd6747d745/scss/_variables.scss#L680

Which should be based on $primary instead of a hardcoded value.

Thanks