Horizontal connector line on the horizontal stepper doesn't display in IE 11

[bramick]

I'm not sure if this is an issue on other IE versions.

For E11 https://github.com/ahlechandre/mdl-stepper/blob/master/src/stepper/_stepper.scss#L419 Usage of :after breaks IE, so when this doesn't render the connector line, the title text is centered instead of being left aligned.

The title text is centered because: https://github.com/ahlechandre/mdl-stepper/blob/master/src/stepper/_stepper.scss#L373 Replacing "center" with "flex-start" or "space-between" would make the text in IE left align like the other browsers, regardless of the absence of the connector line.