CodePen Embed - CSS only drop down menu


<div class="container">
     <nav>
      <input id="toggle" type="checkbox" checked>
     <h2>Drop Down Menu</h2>
   <ul>
     <li><a href="#chapter1">Chapter 01</a></li>
     <li><a href="#chapter2">Chapter 02</a></li>
     <li><a href="#chapter3">Chapter 03</a></li>
     <li><a href="#chapter4">Chapter 04</a></li>
   </ul>
</nav>
  <h2 id="chapter1">Some chapter about wheat.</h2>
  <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
    <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
    <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
    <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
  <h2 id="chapter2">Some chapter about wheat.</h2>
  <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
    <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
    <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
    <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
  <h2 id="chapter3">Some chapter about wheat.</h2>
  <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
    <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
    <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
    <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
  <h2 id="chapter3">Some chapter about wheat.</h2>
  <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
    <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
    <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
    <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
  <h2 id="chapter4">Some chapter about wheat.</h2>
  <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
    <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
    <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
    <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ex molestiae sint corrupti excepturi consequuntur sequi, enim adipisci aperiam iure nobis nesciunt tempora itaque, quos officia mollitia recusandae asperiores. Dignissimos?
  </p>
</div>

body {
  background: #ece5da;
  font-family: "Raleway", sans-serif;
  color: ivory;
  font-size: 20px;
}

nav {
  margin: auto;
  margin-top: 40px;
  position: relative;
  width: clamp(320px, 50vw ,100%);
}

nav h2 {
  font-size: 1.5rem;
  border-radius: 2px;
  position: relative;
  background: tomato;
  height: 40px;
  text-transform: uppercase;
  margin-bottom: 0;
  color: inherit;
  font-weight: 200;
  display: flex;
  flex: 1;
  justify-content: center;
  align-items: center;
  box-shadow: 4px 4px 20px -2px rgba(0, 0, 0, 0.35);
  transition: all 0.4s;
}

nav:hover h2 {
  transform: translateY(-2px);
  box-shadow: 2px 2px 5px -1px rgba(0, 0, 0, 0.35);
  transistion: all 0.4s;
}

#toggle {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  z-index: 1;
  opacity: 0;
  cursor: pointer;
  height: 40px;
}

h2::before{
  position: absolute;
  right: 0;
  top: 0;
  height: inherit;
  aspect-ratio: 1;
  background: currentColor;
  display: flex;
  align-items: center;
  padding-right: 1rem;
  content: "";
  clip-path: polygon(50% 25%, 20% 80%, 80% 80%);
  transform: rotate(180deg) scale(0.75);
}

#toggle:not(:checked) ~ h2::before {
  transform: rotate(0deg) scale(0.75);
}

#toggle:focus ~ h2{
  background: mediumorchid;
  transition: background 0.45s;
}

#toggle:checked ~ ul {
  visibility: hidden;
  opacity: 0;
}

#toggle:not(:checked) ~ ul {
  opacity: 1;
  transition: opacity 0.3s ease-in-out;
}


nav ul {
  padding-left: 0;
  padding-top: 1rem;
  margin-top: 0;
  background: #ece5da;
  list-style: none;
  overflow: hidden;
  text-align: right;
  text-align: center;
  transition: all 0.4s ease-out;
  width: 100%;
  position: absolute;
}
nav ul li {
  border-radius: 2px;
  position: relative;
  display: inline-block;
  line-height: 1.5;
  width: 100%;
  margin: 0 0 0.25rem 0;
  background: tomato;
  transition: background 3s;
  box-shadow: 2px 2px 10px -2px rgba(0, 0, 0, 0.35);
}

nav ul li:hover,
nav ul li a:focus {
  background: mediumorchid;
  transition: background 0.45s;
}

nav ul a {
  display: block;
  color: inherit;
  text-transform: lowercase;
  font-weight: 200;
  text-decoration: none;
}


.container {
  max-width: 55ch;
  margin: auto;
  color: #36454F;
}

    // let links = document.querySelectorAll('ul > li > a');

// links.forEach(link => link.addEventListener('click', (e)=> console.log(e.target.innerText)))

This Pen is owned by steven on CodePen.

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