sundlee/menu-transition.html

## menu-transition.html
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
/* Base styles */
body {
  margin: 0;
  padding: 0;
  background: #232323;
  color: #cdcdcd;
  font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Helvetica, Arial, sans-serif, Apple Color Emoji, Segoe UI Emoji
}

#menuToggle {
  display: block;
  position: relative;
  top: 50px;
  left: 50px;
  z-index: 1;
  user-select: none;
}

#menuToggle a {
  text-decoration: none;
  color: #232323;
  transition: color 0.3s ease;
}

#menuToggle a:hover {
  color: #4f7794;
}

/* The hamburger button hidden inside an input element */
#menuToggle input {
  display: block;
  width: 30px;
  height: 30px;
  position: absolute;
  top: -7px;
  left: -5px;
  padding: 0;
  cursor: pointer;
  opacity: 0; /* hide this */
  z-index: 2; /* and place it over the hamburger */
}

#menuToggle label {
  position: relative;
  display: block;
  width: 30px;
  height: 30px;
}

#menuToggle label span {
  display: none;
}

/*
 * Hamburger
 */
#menuToggle label div {
  display: block;
  width: 30px;
  height: 2px;
  margin-bottom: 6px;
  position: relative;
  background: #cdcdcd;
  border-radius: 3px;
  z-index: 1;
  transform-origin: 4px 0px;
  transition: all 0.3s ease;
}

#menuToggle label div:first-child {
  transform-origin: 0% 100%;
}

#menuToggle label div:nth-child(2) {
  transform-origin: 0% 0%;
}

/*
 * Change the color of the hamburger when toggled
 */
#menuToggle input:checked + label div {
  background: #232323;
}

/*
 * Use absolute positioning to place the menu off-screen
 */
#menu {
  position: absolute;
  width: 300px;
  margin: -100px 0 0 -50px;
  padding: 50px;
  padding-top: 125px;
  background: #ededed;
  list-style-type: none;
  /* Hide the menu off-screen to the left */
  left: -100%;
  transition: left 0.3s ease;
}

#menu li {
  padding: 10px 0;
  font-size: 22px;
}

/*
 * Slide the menu in from left when the input is checked
 */
#menuToggle input:checked ~ ul {
  left: 0;
}
  </style>
</head>
<body>
  <nav role="navigation">
    <div id="menuToggle">
      <!--
      hidden checkbox is used as click reciever,
      so you can use the :checked selector on it.
      -->
      <input name="toggle" type="checkbox" />
      <label for="toggle">
        <span>menu</span>
        <!--
        divs to be styled as a hamburger button
        -->
        <div></div>
        <div></div>
        <div></div>
      </label>


      <!--
      the menu that will slide in from the left
      -->
      <ul id="menu">
        <a href="#">
          <li>Home</li>
        </a>
        <a href="#">
          <li>About</li>
        </a>
        <a href="#">
          <li>Contact</li>
        </a>
      </ul>
    </div>
  </nav>
</body>
</html>