setDOM = (divClass) => {
    clearDOM();
    const wrapperDOM = document.createElement('div');
    wrapperDOM.setAttribute("id", "root");

    const keyboardDOM = document.createElement('div');
    keyboardDOM.className = divClass || "simple-keyboard";

    wrapperDOM.appendChild(keyboardDOM);
    document.body.appendChild(wrapperDOM);
  }
Sets a basic DOM structure to test in