Pageboy/navigation.html

## navigation.html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="css/styles.css" />
    <title>Responsive Menu</title>
  </head>
  <body>
    <nav>
    <input type="checkbox" id="toggle" />
    <label for="toggle" class="hamburger">&#9776;</label>
    <ul>
      <li><a href="#">Home</a></li>
      <li><a href="#">Information</a>
        <ul>
          <li><a href="#">Services</a></li>
          <li><a href="#">Support</a></li>
          <li><a href="#">Products</a></li>
        </ul>
      </li>
      <li><a href="#">About</a></li>
      <li><a href="#">News</a></li>
      <li><a href="#">Contact</a></li>
    </ul>
  </nav>
  </body>
</html>

## styles.css
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: verdana, sans-serif;
  margin: 2em;
  padding: 0;
}

nav {
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
  background-color: silver;
}

nav ul {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

nav ul li {
  flex: 0 0 8rem; /*the same as flex-grow, flex-shrink, flex-basis */
  text-align: center;
}

/* we turn off the underline and set the padding and the color O */

nav ul li a {
  text-decoration: none;
  padding: 0.8rem 1rem;
  display: block;
  color: green;
}

/* feedback for the user with a background when hovering hover */

nav ul li:hover {
  background-color: black;
}

nav ul li a:hover {
  color: white;
}

/* sub menus */

li ul {
  display: none;
  position: absolute;
  background-color: black;
}

li ul li a {
  padding: 0.3rem 1.5rem;
  /*   font-size: 0.8rem; */
}

nav ul li:hover ul {
  display: flex;
  flex-direction: column;
}

nav ul li ul li {
  flex: 0 1 auto;
  width: 8rem; /* the same as the value for flex-basis on the parent li */
}

/* now for the smaller displays */

@media screen and (max-width: 900px) {
  nav ul {
    flex-direction: column;
  }

  li ul {
    position: static;
  }

  nav ul li {
    flex: 0 0 auto; /*the same as flex-grow, flex-shrink, flex-basis */
    width: 100%;
  }

  nav ul li:hover ul {
    display: flex;
    flex-direction: column;
    width: 100%;
  }
}

/* Now let’s try with the hamburger menu

In this version we need to use a hamburger menu item that will reveal the menu. For this we need a checkbox as input that will toggle this on and off.

We need to add this the following HTML inside the nav */

/* <input type="checkbox" id="toggle">
<label for="toggle" class="hamburger">&#9776;</label> */

/* Note that ☰ is an HTML entity that displays the ☰ (hamburger icon.)

Now in the CSS we need to hide this item when we are in the normal wide screen view: */

/* we hide the hamburger icon until we are on a small screen */

input[type="checkbox"] {
  display: none;
}

.hamburger {
  display: none;
  font-size: 2rem;
  color: white;
}

/* So when the display is small we can use our media query to hide the menu but reveal the hamburger */

@media screen and (max-width: 900px) {
  .hamburger {
    display: block;
    float: right;
    cursor: pointer;
  }

  /*   but we also need to hide the menu until that hamburger is clicked */

  nav ul {
    display: none;
  }

  /*when the hamburger is clicked the ul below it will be made to show */
  /*  the tilda ~ points to the next sibling selector */

  input[type="checkbox"]:checked ~ ul {
    display: block;
  }
}
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8" />
	<meta http-equiv="X-UA-Compatible" content="IE=edge" />
	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
	<link rel="stylesheet" href="css/styles.css" />
	<title>Responsive Menu</title>
	</head>
	<body>
	<nav>
	<input type="checkbox" id="toggle" />
	<label for="toggle" class="hamburger">☰</label>
	<ul>
	<li><a href="#">Home</a></li>
	<li><a href="#">Information</a>
	<ul>
	<li><a href="#">Services</a></li>
	<li><a href="#">Support</a></li>
	<li><a href="#">Products</a></li>
	</ul>
	</li>
	<li><a href="#">About</a></li>
	<li><a href="#">News</a></li>
	<li><a href="#">Contact</a></li>
	</ul>
	</nav>
	</body>
	</html>
	* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
	}

	body {
	font-family: verdana, sans-serif;
	margin: 2em;
	padding: 0;
	}

	nav {
	width: 100%;
	position: fixed;
	top: 0;
	left: 0;
	background-color: silver;
	}

	nav ul {
	list-style: none;
	display: flex;
	align-items: center;
	justify-content: flex-end;
	}

	nav ul li {
	flex: 0 0 8rem; /the same as flex-grow, flex-shrink, flex-basis /
	text-align: center;
	}

	/* we turn off the underline and set the padding and the color O */

	nav ul li a {
	text-decoration: none;
	padding: 0.8rem 1rem;
	display: block;
	color: green;
	}

	/* feedback for the user with a background when hovering hover */

	nav ul li:hover {
	background-color: black;
	}

	nav ul li a:hover {
	color: white;
	}

	/* sub menus */

	li ul {
	display: none;
	position: absolute;
	background-color: black;
	}

	li ul li a {
	padding: 0.3rem 1.5rem;
	/* font-size: 0.8rem; */
	}

	nav ul li:hover ul {
	display: flex;
	flex-direction: column;
	}

	nav ul li ul li {
	flex: 0 1 auto;
	width: 8rem; /* the same as the value for flex-basis on the parent li */
	}

	/* now for the smaller displays */

	@media screen and (max-width: 900px) {
	nav ul {
	flex-direction: column;
	}

	li ul {
	position: static;
	}

	nav ul li {
	flex: 0 0 auto; /the same as flex-grow, flex-shrink, flex-basis /
	width: 100%;
	}

	nav ul li:hover ul {
	display: flex;
	flex-direction: column;
	width: 100%;
	}
	}

	/* Now let’s try with the hamburger menu

	In this version we need to use a hamburger menu item that will reveal the menu. For this we need a checkbox as input that will toggle this on and off.

	We need to add this the following HTML inside the nav */

	/* <input type="checkbox" id="toggle">
	<label for="toggle" class="hamburger">☰</label> */

	/* Note that ☰ is an HTML entity that displays the ☰ (hamburger icon.)

	Now in the CSS we need to hide this item when we are in the normal wide screen view: */

	/* we hide the hamburger icon until we are on a small screen */

	input[type="checkbox"] {
	display: none;
	}

	.hamburger {
	display: none;
	font-size: 2rem;
	color: white;
	}

	/* So when the display is small we can use our media query to hide the menu but reveal the hamburger */

	@media screen and (max-width: 900px) {
	.hamburger {
	display: block;
	float: right;
	cursor: pointer;
	}

	/* but we also need to hide the menu until that hamburger is clicked */

	nav ul {
	display: none;
	}

	/when the hamburger is clicked the ul below it will be made to show /
	/* the tilda ~ points to the next sibling selector */

	input[type="checkbox"]:checked ~ ul {
	display: block;
	}
	}