Use `set!` and `-property` to modify DOM elements with ClojureScript

To modify a DOM element, select it and then use set!. To select it, try (def h2 (.querySelector js/document "h2")). Then with your element, use set!, .., and - for (set! (.. h2 -style -color) "red"). Use this, and you’ll see the first h2 element, if there is one, turn red.