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HTML

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <nav>
  <!--  This is the button to toggele the menu on mobile devices  -->
  <div id="hamburger">
    <div id="bar1"></div>
    <div id="bar2"></div>
    <div id="bar3"></div>
  </div>

  <!-- This is the list of menu items   -->
  <div class="navMenu">
    <ul>
      <li>Skills</li>
      <li>Portfolio</li>
      <li>Services</li>
      <li>Contact</li>
      <li>Resume</li>
    </ul>
  </div>
</nav>
!

CSS 

              
                * {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Hide the menu to the side on mobile and not allow scrolling to the side */
html {
  overflow-x: hidden;
}

/* basic styles for the header component */
nav {
  width: 100%;
  padding: 20px;
}

/* Make nav menu items take full width allocated */
.navMenu ul {
  display: flex;
  justify-content: space-between;
}

.navMenu li {
  list-style: none;
  font-size: 1em;
  text-transform: uppercase;
  font-weight: 500;
  cursor: pointer;
}

.navMenu li:hover {
  color: blue;
}

/* Styles for the hamburger menu icon */
#hamburger {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 10;
}

#hamburger div {
  width: 22px;
  height: 2px;
  background-color: black;
  margin: 4px 0;
  transition: 0.5s;
}

#hamburger {
  display: none;
}

@media screen and (max-width: 768px) {
  #hamburger {
    display: block;
  }

  .navMenu {
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background-color: black;
    transform: translateX(100%);
    transition: 0.5s;
  }

  .navMenu ul {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 15px 0;
  }

  .navMenu li {
    color: white;
    padding: 15px 0;
  }
}

/* Extra utility classes to be added with JS */

.nav-active {
  transform: translateX(0);
}

#hamburger.toggle div {
  background-color: white;
}

.toggle #bar1 {
  transform: rotate(-45deg) translate(-5px, 4px);
}

.toggle #bar2 {
  opacity: 0;
}

.toggle #bar3 {
  transform: rotate(45deg) translate(-5px, -4px);
}
!

JS 

              
                // Responsive hamburger menu demo by Paul Ehikhuemen
var hamburger = document.querySelector("#hamburger");
var nav = document.querySelector(".navMenu");
var navLinks = document.querySelectorAll(".navMenu li");

// close nav by clicking on list items
Array.from(navLinks).forEach((li) =>
  li.addEventListener("click", () => {
    if (hamburger.classList.contains("toggle")) {
      hamburger.classList.remove("toggle");
    }
    if (nav.classList.contains("nav-active")) {
      nav.classList.remove("nav-active");
    }
  })
);

// toggle nav on click of hamburger menu icon
hamburger.addEventListener("click", () => {
  nav.classList.toggle("nav-active");

  // burger animation
  hamburger.classList.toggle("toggle");
});
!
999px

Console