Well, Our company has bought shopify theme and was happily using it. now we like make changes to this theme, mostly cosmetic changes, like changing card colors add some background images, then some layout change.
My question is/are:
1) Can we use bootstrap with existing theme? 2) Does making change to css of existing theme get replace if there is theme update, like WordPress? 3) How can we set it up so we can develop new design locally but our store stays live with old design until we're done developing new one?