function insert(e, newel) {
  e.parentNode.insertBefore(newel, e.nextSiblings);
}
const skin = document.querySelector("#skin");
const copyright = document.createElement("div");
copyright.classList.add("copyright");
copyright.innerHTML = `<a href="https://12x27gif.tistory.com/" target="_blank">H</a>`;
copyright.style.cssText = `
        display: inline-block;
        padding: 10px;
        text-align: center;
        background-color: #fff;
        border: 1px solid #eee;
        border-radius: 8px;
      `;
const copyHref = copyright.querySelector("a");
copyHref.style.cssText = `
        display: block;
      `;
insert(skin, copyright);