Card borders are invisible with $font-size-root less than 16px
Created by: heruan
Related to https://github.com/twbs/bootstrap/issues/17210 since $card-border-width is set to 0.625rem which computes to 1px only with $font-size-root: 16px.
Created by: heruan
Related to https://github.com/twbs/bootstrap/issues/17210 since $card-border-width is set to 0.625rem which computes to 1px only with $font-size-root: 16px.