Simple Dropdown Navigation Menu with HTML , CSS & Javascript

Web Design & Web Development

Demo

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Code

HTML

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title>Dropdown Menu</title>
    <link rel="stylesheet" type="text/css" href="https://demo.plantpot.works/assets/css/normalize.css">
    <link rel="stylesheet" href="https://use.typekit.net/opg3wle.css">
    <link rel="stylesheet" type="text/css" href="style.css">
  </head>
  <body>
    <div id="container">
      <div class="box" aria-haspopup="true">
        <button id="btn-dropdown" class="btn-dropdown">Dropdown Menu</button>
        <nav id="nav-dropdown" class="nav-dropdown">
          <ul>
            <li><a href="#">Menu 1</a></li>
            <li><a href="#">Menu 2</a></li>
            <li><a href="#">Menu 3</a></li>
          </ul>
        </nav>
      </div>
    </div>
  </body>
</html>

CSS

@charset "utf-8";
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  font-size: 16px;
}
body {
  background-color: #f7f4e5;
  font-family: futura-pt, sans-serif;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
}
#container {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 300px;
  padding: 20px 0;
}
.box {
  position: relative;
}
.btn-dropdown {
  padding: 10px 20px;
  border: none;
  border-radius: 4px;
  background: #6666e2;
  color: #fff;
  font-size: 1.25rem;
  outline: none;
  cursor: pointer;
}
.btn-dropdown::after {
  display: inline-block;
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
  width: 8px;
  height: 8px;
  margin-left: 10px;
  border-right: 2px solid #FFF;
  border-bottom: 2px solid #FFF;
  vertical-align: 4px;
  content: '';
}
.btn-dropdown:hover {
  opacity: .9;
}
.nav-dropdown {
  display: none;
  position: absolute;
  top: 50px;
  left: 0;
  right: 0;
  padding: 10px 0;
  border-radius: 4px;
  box-shadow: 0 0.5rem 2rem rgba(0, 0, 0, .1);
  background-color: #fff;
}
.nav-dropdown ul {
  list-style-type: none;
}
.nav-dropdown ul li {
  padding: 8px 0;
  font-size: 18px;
  text-align: center;
  cursor: pointer;
}
.nav-dropdown ul li a {
  display: block;
  color: #3d3935;
  text-decoration: none;
}
.nav-dropdown ul li:hover {
  background-color: #6666e2;
}
.nav-dropdown ul li:hover a {
  color: #fff;
}
.nav-dropdown.is-open {
  display: block;
}
.btn-dropdown.is-open::after {
  -webkit-transform: rotate(-135deg);
  transform: rotate(-135deg);
  vertical-align: middle;
}
@media screen and (max-width: 480px) {
  #container {
    align-items: flex-start;
  }
}

Javascript

var btn = document.getElementById("btn-dropdown");
var nav = document.getElementById("nav-dropdown");

btn.addEventListener('click', () => {
  if(!btn.classList.contains("is-open")) {
    btn.classList.add("is-open");
    nav.classList.add("is-open");
  } else {
    btn.classList.remove("is-open");
    nav.classList.remove("is-open");
  }
});