const div = document.createElement("div");
div.style.padding = "2rem";
div.style.display = "flex";
div.style.justifyContent = "space-between";
div.style.maxWidth = "700px";
const button = document.createElement("button");

const colors = ["indigo", "purple", "gold", "khaki", "aqua"];
function getRandomColor() {
  return colors[Math.floor(Math.random()*colors.length)];
}
button.innerText = "do something";
button.addEventListener("click", () => {
  div.style.backgroundColor = getRandomColor();
});

div.appendChild(button);

document.body.appendChild(div);