<h2>Cool</h2>
  <nav class="top">
    <div class="dropdownBackground">
      <span class="arrow"></span>
    </div>

    <ul class="cool">
      <li>
        <a href="#">About Me</a>
        <div class="dropdown dropdown1">
          <div class="bio">
            <img src="https://logo.clearbit.com/wesbos.com">
            <p>Wes Bos sure does love web development. He teaches things like JavaScript, CSS and BBQ. Wait. BBQ isn't part of web development. It should be though!</p>
          </div>
        </div>
      </li>
      <li>
        <a href="#">Courses</a>
        <ul class="dropdown courses">
          <li>
            <span class="code">RFB</span>
            <a href="https://ReactForBeginners.com">React For Beginners</a>
          </li>
          <li>
            <span class="code">ES6</span>
            <a href="https://ES6.io">ES6 For Everyone</a>
          </li>
          <li>
            <span class="code">NODE</span>
            <a href="https://LearnNode.com">Learn Node</a>
          </li>
          <li>
            <span class="code">STPU</span>
            <a href="https://SublimeTextBook.com">Sublime Text Power User</a>
          </li>
          <li>
            <span class="code">WTF</span>
            <a href="http://Flexbox.io">What The Flexbox?!</a>
          </li>
          <li>
            <span class="code">GRID</span>
            <a href="https://CSSGrid.io">CSS Grid</a>
          </li>
          <li>
            <span class="code">LRX</span>
            <a href="http://LearnRedux.com">Learn Redux</a>
          </li>
          <li>
            <span class="code">CLPU</span>
            <a href="http://CommandLinePowerUser.com">Command Line Power User</a>
          </li>
          <li>
            <span class="code">MMD</span>
            <a href="http://MasteringMarkdown.com">Mastering Markdown</a>
          </li>
        </ul>
      </li>
      <li>
        <a href="#">Other Links</a>
        <ul class="dropdown dropdown3">
          <li><a class="button" href="http://twitter.com/wesbos">Twitter</a></li>
          <li><a class="button" href="http://facebook.com/wesbos.developer">Facebook</a></li>
          <li><a class="button" href="http://wesbos.com">Blog</a></li>
          <li><a class="button" href="http://wesbos.com/courses">Course Catalog</a></li>
        </ul>
      </li>
    </ul>
  </nav>
html {
    box-sizing: border-box;
    font-family: "Arial Rounded MT Bold","Helvetica Rounded",Arial,sans-serif
  }
  *, *:before, *:after {
    box-sizing: inherit;
  }
  body {
    margin: 0;
    min-height: 100vh;
    background:
      linear-gradient(45deg, hsla(340, 100%, 55%, 1) 0%, hsla(340, 100%, 55%, 0) 70%),
      linear-gradient(135deg, hsla(225, 95%, 50%, 1) 10%, hsla(225, 95%, 50%, 0) 80%),
      linear-gradient(225deg, hsla(140, 90%, 50%, 1) 10%, hsla(140, 90%, 50%, 0) 80%),
      linear-gradient(315deg, hsla(35, 95%, 55%, 1) 100%, hsla(35, 95%, 55%, 0) 70%);
  }

  h2 {
    margin-top: 0;
    padding-top: .8em;
  }

  nav {
    position: relative;
    perspective: 600px;
  }

  .cool > li > a {
    color: yellow;
    text-decoration: none;
    font-size: 20px;
    background: rgba(0,0,0,0.2);
    padding:10px 20px;
    display: inline-block;
    margin:20px;
    border-radius:5px;
  }

  nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
  }

  .cool > li {
    position: relative;
    display:flex;
    justify-content: center;
  }

  .dropdown {
    opacity: 0;
    position: absolute;
    overflow: hidden;
    padding:20px;
    top:-20px;
    border-radius:2px;
    transition: all 0.5s;
    transform: translateY(100px);
    will-change: opacity;
    display: none;
  }

  .trigger-enter .dropdown {
    display: block;
  }

  .trigger-enter-active .dropdown {
    opacity: 1;
  }



  .dropdownBackground {
    width:100px;
    height:100px;
    position: absolute;
    background: #fff;
    border-radius: 4px;
    box-shadow: 0 50px 100px rgba(50,50,93,.1), 0 15px 35px rgba(50,50,93,.15), 0 5px 15px rgba(0,0,0,.1);
    transition:all 0.3s, opacity 0.1s, transform 0.2s;
    transform-origin: 50% 0;
    display: flex;
    justify-content: center;
    opacity:0;
  }

  .dropdownBackground.open {
    opacity: 1;
  }

  .arrow {
    position: absolute;
    width:20px;
    height:20px;
    display: block;
    background:white;
    transform: translateY(-50%) rotate(45deg);
  }

  .bio {
    min-width:500px;
    display:flex;
    justify-content: center;
    align-items: center;
    line-height: 1.7;
  }

  .bio img {
    float:left;
    margin-right:20px;
  }

  .courses {
    min-width:300px;
  }

  .courses li {
    padding: 10px 0;
    display: block;
    border-bottom: 1px solid rgba(0,0,0,0.2);
  }

  .dropdown a {
    text-decoration: none;
    color: #ffc600;
  }

  a.button {
    background:black;
    display: block;
    padding:10px;
    color:white;
    margin-bottom: 10px;
  }


  /* Matches Twitter, TWITTER, twitter, tWitter, TWiTTeR... */
  .button[href*=twitter] { background: #019FE9; }
  .button[href*=facebook] { background: #3B5998; }
  .button[href*=courses] { background: #ffc600; }
const triggers = document.querySelectorAll(".cool > li");
const background = document.querySelector(".dropdownBackground");
const nav = document.querySelector(".top");

function handleEnter() {
  this.classList.add("trigger-enter");
  setTimeout(
    () =>
      this.classList.contains("trigger-enter") &&
      this.classList.add("trigger-enter-active"),
    150
  );

  background.classList.add("open");
  const dropdown = this.querySelector(".dropdown");
  const dropdownCoords = dropdown.getBoundingClientRect();

  const height = dropdownCoords.height;
  const width = dropdownCoords.width;

  background.style.setProperty("width", `${width}px`);
  background.style.setProperty("height", `${height}px`);

  const navCoords = nav.getBoundingClientRect();
  const top = dropdownCoords.top - navCoords.top;
  const left = dropdownCoords.left - navCoords.left;
  background.style.setProperty("transform", `translate(${left}px, ${top}px)`);
}

function handleLeave() {
  this.classList.remove("trigger-enter", "trigger-enter-active");
  background.classList.remove("open");
}

triggers.forEach(trigger =>
  trigger.addEventListener("mouseenter", handleEnter)
);
triggers.forEach(trigger =>
  trigger.addEventListener("mouseleave", handleLeave)
);

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.