• https://cdn.bootcdn.net/ajax/libs/smooth-scroll/16.0.2/smooth-scroll.js
• https://cdn.bootcdn.net/ajax/libs/smooth-scroll/16.0.2/smooth-scroll.min.js
• https://cdn.bootcdn.net/ajax/libs/smooth-scroll/16.0.2/smooth-scroll.polyfills.js
• https://cdn.bootcdn.net/ajax/libs/smooth-scroll/16.0.2/smooth-scroll.polyfills.min.js