Fixes issue periods in names

[regularlabs]

The css is messed up when the names contain periods, like:

'0.5': '0.125rem'

This will result in css like:

.-indent-0.\35{
  text-indent: -0.125rem;
}

After this fix it will correctly generate:

.-indent-\.5{
  text-indent: -0.125rem;
}