Can anyone please recommend a JS library for popup windows?

I'm looking for something like api.jqueryui.com/dialog. Looking to upgrade legacy code in a mature product from prototype-window.xilinus.com/samples.html which is showing its age a bit (Prototype framework, hard-coded pixels all over the place) and am considering a switch to a modern framework- Vue.js is the front runner- or if trusty jQuery + jQueryUI is the way forward, as the UI of this SPA revolves around rendering Rails partial views in pop-up windows. Thanks!

EDIT: Thanks for those who've responded so far. One thing I should have said explicitly: I'm looking for draggable windows that allow you to continue to interact with the underlying SPA, rather than something for modals. (The service is basically an asset management system that acts as an overlay Google maps, and the present design allows people to interact with the app whilst keeping an eye on what's going on on the main page.)