If by responsive you mean one style that resizes itself perfectly for every device, then good luck with that in vb4....
But it switches to metro style on a mobile (it won't do this if you just switch to mobile mode in chrome inspect tool - you have to actually use a mobile device, or select it from the style picker drop down) and Google thinks it's mobile friendly with Google Search Console reporting no mobile issues.
It's not perfect but looks decent and works
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