You can copy the theme for border (and cursor), including the style file in your sway config.
Note: I only really need border for the current focused window, so the inactive broder is set to background color. If you want a more visible vorder, replace #000b1e with #0abdc6 (for example) on client.[focused_inactive|unfocused]
The waybar config & style.css are on the waybar folder. Simply copy them and restart sway to get the layout.
cp -r waybar ~/.config