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HTML

              
                <!-- 
Feel free to use!
Follow me on Twitter: https://twitter.com/skarjan42
Or on GitHub: https://github.com/skarjan
-->
<html>

<head>
  <title>Codepen
  </title>
  <link rel="stylesheet" href="css/codepen.css">
</head>

<body>
  <nav class="nav">
    <div>
      <a href="#">
        <h1 class="fancy clr-blue">website.com</h1>
      </a>
    </div>

    <div class="link-lang-container">
      <div class="hide" id="linkContainer">
        <div class="active-link anchor">
          <a href="#">Home</a>

          <div class="active-border border">
            Home
          </div>
        </div>

        <div class="hov-link anchor">
          <a href="#">CV</a>

          <div class="hov-border border">
            CV
          </div>
        </div>

        <div class="hov-link anchor">
          <a href="#">GitHub</a>

          <div class="hov-border border">
            GitHub
          </div>
        </div>
      </div>

      <div class="sm-menu-container">
        <div class="active-lang nl lang-anchor">
          <a href="#">NL</a>

          <div class="active-lang-border lang-border">
            <!-- hack to get language highlighting without border -->
          </div>
        </div>
        <span>|</span>

        <div class="lang-link eng lang-anchor">
          <a href="#">ENG</a>

          <div class="lang-border lang-border">
            <!-- hack to get language highlighting without border -->
          </div>
        </div>

        <div class="nav-menu-sm">
          <button class="menu-hb" id="menu-hb" type="button"><svg height="25" viewbox="0 0 100 45" width="25">
              <rect height="10" width="100" y="0">
              </rect>

              <rect height="10" width="100" y="30">
              </rect>

              <rect height="10" width="100" y="60">
              </rect>
            </svg></button>
        </div>
      </div>
    </div>
  </nav>
  <div class="flex-items-centered">
    <div>

      <h1 class="fancy display-lg flex-items-centered vh-90">Responsive Navigation/Menu</h1>
    </div>
  </div>
</body>

</html>
              
            
!

CSS

              
                /* fonts */

@import url("https://fonts.googleapis.com/css2?family=Orelega+One&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Happy+Monkey&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Bowlby+One+SC&family=Bungee&display=swap");
@import url(//fonts.googleapis.com/css?family=Open+Sans:400,300,600,700);

/* colors */
/* primary: #5a189a */

/*  reset */

* {
  margin: 0;
  padding: 0;
  font-size: inherit;
  color: inherit;
  box-sizing: inherit;
  backface-visibility: hidden;
  -webkit-font-smoothing: antialiased;
}

*:focus {
  outline: none;
}

html,
body {
  height: 100%;
  /* different from scss source */
  overflow: auto;
  /* different from scss source */
}

html {
  font-size: 16px;
  box-sizing: border-box;
}

body {
  background-color: #ecf0f1;
  min-width: 300px;
  font-family: "Open Sans", sans-serif;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  display: block;
  font-weight: 400;
}

li,
span,
p,
a,
h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1;
}

p {
  display: block;
}

a {
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 0;
}

button {
  background-color: transparent;
  border: 0;
  cursor: pointer;
}

.show {
  display: inline-block;
  opacity: 1;
}

/* Element styles */
html {
  font-size: 15px;
}

body {
  background-color: #ffffff;
  line-height: 1.4em;
}

a:hover {
  text-decoration: none;
}

h1 {
  font-size: 1.6rem;
  font-weight: 900;
}

h2 {
  font-size: 1.5rem;
  font-weight: 800;
}

h3 {
  font-size: 1.4rem;
  font-weight: 800;
}

h4 {
  font-size: 1.3rem;
  font-weight: 700;
}

h5 {
  font-size: 1.2rem;
  font-weight: 600;
}

h6 {
  font-size: 1.1rem;
  font-weight: 500;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin-top: 0;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

p {
  margin-top: 0;
  font-size: 1rem;
  margin-bottom: 1rem;
  line-height: 1.1;
}

small {
  font-size: 12px;
}

/* Flex classes */
.flex-items-centered {
  display: flex;
  align-items: center;
  align-content: flex-start;
  justify-content: center;
}

.flex-horizontal {
  display: flex;
}

/* utility classes */
.clr-blue {
  color: #5a189a;
}

.clr-dark-red {
  color: #7c0000;
}

.sm-text {
  font-size: 12px;
}

.display-lg {
  font-size: 3rem;
}

.vh-90 {
  height: 75vh;
}

/* custom styles */
/* baseline */
.shadow {
  box-shadow: 0px 2px 18px 0px rgb(0 0 0 / 30%);
}

.text-content {
  color: black;
}

.image-content {
  min-width: 65px;
}

.skills {
  font-size: 12px;
}

.quote-container {
  font-size: 14px;
  float: right;
}

.img-container {
  padding: 16px;
  margin: 8px;
  max-width: 682px;
}

.img-container i {
  line-height: 1.7rem;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-width: 320px;
  max-width: 1080px;
  margin: 0 auto;
  padding: 34px;
  border-bottom: 1px solid #dcdcdc;
}

.hov-link,
.lang-link {
  padding: 8px 12px;
  display: inline-block;
  position: relative;
}

.eng {
  padding: 8px 12px 8px 0 !important;
}

.nl {
  padding: 8px 0 8px 12px !important;
}

.hov-border,
.lang-border {
  position: absolute;
  top: 34px;
  border-top: solid 3px rgb(90, 24, 154, 0%);
  color: rgb(0, 0, 0, 0%);
  transition-property: border-top, top;
  transition-duration: 0.4s, 0.5s;
}

.hov-link:hover > .hov-border,
.lang-link:hover > .lang-border {
  border-top: solid 3px rgb(90, 24, 154, 100%);
  top: 30px;
}

.active-link,
.active-lang {
  position: relative;
  padding: 8px 12px;
  display: inline-block;
  position: relative;
  color: #5a189a;
}

.active-border,
.active-lang-border {
  position: absolute;
  top: 30px;
  color: rgb(0, 0, 0, 0%);
  border-top: 3px solid #5a189a;
}

/* this hides the copy of text which is used to determine the border length */
.border {
  user-select: none;
}

.flex-container {
  padding: 36px 8px;
  margin: 0 auto;
  max-width: 1024px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.fancy {
  font-family: "Bungee", cursive;
  font-weight: 500;
  margin: 0;
}

.sm-menu-container {
  font-size: 14px;
}

/* end of baseline */

/* responsiveness */

/*  big phones */
@media only screen and (min-width: 444px) and (max-width: 768px) {
}

/* big and small phones */
@media only screen and (max-width: 768px) {
  .hide {
    display: none;
    opacity: 0;
  }

  nav {
    position: relative;
  }

  .responsive-links {
    box-shadow: 0px 8px 18px 0px rgb(0 0 0 / 30%);
    max-width: 748px;
    width: 100%;
    top: 75px;
    left: 0px;
    background-color: #fff;
    position: absolute;
    padding-bottom: 16px;
    transition: top, 0.2s;
    z-index: 1;
    padding: 8px 0;
    transition: top, 0.5s;
  }

  .display-lg {
    font-size: 1.8rem;
  }

  .responsive-links > div {
    display: block;
  }

  .sm-menu-container {
    display: flex;
    align-items: center;
    font-size: 14px;
  }
}

/* tablets */

@media only screen and (min-width: 768px) and (max-width: 1080px) {
  .hide {
    display: none;
  }

  .sm-menu-container {
    display: flex;
    align-items: center;
    font-size: 14px;
  }

  .display-lg {
    font-size: 2.5rem;
  }

  .responsive-links {
    box-shadow: 0px 8px 18px 0px rgb(0 0 0 / 30%);
    max-width: 1060px;
    min-width: 768px;
    width: 100%;
    top: 75px;
    left: 0;
    background-color: #fff;
    position: absolute;
    padding: 8px 0;
    transition: top, 0.5s, opacity, 0.4s;
    opacity: 0;
    z-index: 1;
  }

  .responsive-links > div {
    display: block;
  }
}

@media only screen and (min-width: 1080px) {
  .link-lang-container {
    display: flex;
    align-items: baseline;
  }

  .nav-menu-sm {
    display: none;
  }
}

              
            
!

JS

              
                "use strict";

function isLinkExternal(anchor) {
  return anchor.children[0].hasAttribute("target");
}

function addMenuEventListeners() {
  // show/hide when clicking the hamburger icon
  document.getElementById("menu-hb").addEventListener("click", toggleMenu);

  // hide when clicking (almost) anywhere on the page
  document
    .getElementsByTagName("body")[0]
    .addEventListener("click", toggleMenu);

  // event listeners to display active/inactive links
  addClickListeners(
    "anchor",
    "border",
    "active-link",
    "active-border",
    "hov-link",
    "hov-border"
  );
  addClickListeners(
    "lang-anchor",
    "lang-border",
    "active-lang",
    "active-lang-border",
    "lang-link",
    "lang-border"
  );
}

function addClickListeners(
  link,
  border,
  activeAnchor,
  activeBorder,
  anchor,
  regularBorder
) {
  let links = document.getElementsByClassName(link);
  let borders = document.getElementsByClassName(border);

  for (let i = 0; i < links.length; i++) {
    links[i].addEventListener("click", function () {
      let self = this;
      if (!isLinkExternal(self)) {
        deactivateLink(activeAnchor, activeBorder, anchor, regularBorder);
        activateLink(
          links,
          borders,
          i,
          activeAnchor,
          activeBorder,
          anchor,
          regularBorder
        );
      }
    });
  }
}

function deactivateLink(activeAnchor, activeBorder, anchor, border) {
  // needs the active language lin
  let elLink = document.getElementsByClassName(activeAnchor);
  let elBorder = document.getElementsByClassName(activeBorder);
  // needs the inactive language link
  elLink[0].classList.add(anchor);
  elLink[0].classList.remove(activeAnchor);

  elBorder[0].classList.add(border);
  elBorder[0].classList.remove(activeBorder);
}

function activateLink(
  links,
  borders,
  i,
  activeAnchor,
  activeBorder,
  anchor,
  border
) {
  links[i].classList.add(activeAnchor);
  links[i].classList.remove(anchor);

  borders[i].classList.add(activeBorder);
  borders[i].classList.remove(border);
}

function toggleMenu() {
  let self = this;

  // show/hide on hb menu icon click
  let linkContainer = document.getElementById("linkContainer");

  if (
    linkContainer.classList[0] !== "responsive-links" &&
    self.classList[0] == "menu-hb"
  ) {
    // show
    linkContainer.classList.add("responsive-links");
    linkContainer.classList.add("show");
    linkContainer.classList.remove("hide");

    // animate
    // begin state
    document.getElementsByClassName("responsive-links")[0].style.opacity = "0";

    // end state
    setTimeout(function () {
      document.getElementsByClassName("responsive-links")[0].style.top =
        "106px";
      document.getElementsByClassName("responsive-links")[0].style.opacity =
        "100";
    }, 1);
  } else if (
    linkContainer.classList[0] == "responsive-links" &&
    self.classList[0] === "menu-hb"
  ) {
    // animate
    document.getElementsByClassName("responsive-links")[0].style.top = "75px";
    document.getElementsByClassName("responsive-links")[0].style.opacity = "0";

    // hide
    setTimeout(function () {
      linkContainer.classList.remove("responsive-links");
      linkContainer.classList.remove("show");
      linkContainer.classList.add("hide");
    }, 400);
  }

  // hide menu if user clicks on the body
  if (
    linkContainer.classList[0] == "responsive-links" &&
    self.classList[0] == "content"
  ) {
    // animate
    document.getElementsByClassName("responsive-links")[0].style.opacity = "0";

    document.getElementsByClassName("responsive-links")[0].style.top = "75px";
    // document.getElementsByClassName("responsive-links")[0].style.opacity = "0";

    // hide
    setTimeout(function () {
      linkContainer.classList.remove("responsive-links");
      linkContainer.classList.remove("show");
      linkContainer.classList.add("hide");
    }, 400);
  }
}

// Work around for opacity issue
function is1080Wide() {
  var mQ = window.matchMedia("(min-width: 1080px)");

  mQ.addEventListener("change", setOpacityOnLinks);
}

function setOpacityOnLinks(mediaQuery) {
  if (mediaQuery.matches) {
    document.getElementById("linkContainer").style.opacity = 1;
  }
}

addMenuEventListeners();
is1080Wide();

              
            
!
999px

Console