Get rid of final piece of inline JS

content/demo/demo.js

@@ -1,3 +1,13 @@
+// Slider
+var slider = document.getElementById("range");
+var output = document.getElementById("range-value");
+output.innerHTML = slider.value;
+
+slider.oninput = function() {
+  output.innerHTML = this.value;
+}
+
+// Spaceship control center
 const colorPickerLight = document.querySelector("#color-picker-light");
 const colorPickerDark = document.querySelector("#color-picker-dark");
 const contrastCheckboxLight = document.querySelector("#contrast-color-light");