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HTML

              
                <link href='https://fonts.googleapis.com/css?family=Open+Sans' rel='stylesheet' type='text/css'>

<!-- The overlay Menu -->
<div id="myNav" class="overlay">
  
  <!-- Button to close the overlay navigation -->
  <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
  
  <!-- Overlay content -->
  <div class="overlay-content">
    <a href="http://www.chris-cook.net" target="_blank">HOME</a>
    <a href="http://www.chris-cook.net" target="_blank">ABOUT</a>
    <a href="http://www.chris-cook.net" target="_blank">SERVICES</a>
    <a href="http://www.chris-cook.net" target="_blank">CONTACT</a>
  </div>
  
</div>

<div onclick="openNav()" class="navMenu">&#9776;</div>

<div class="myPage">
  
  <h1>MAIN PAGE</h1>
  
  <h3>Place Content Here</h3>
  
</div>
              
            
!

CSS

              
                /* Demo Content */
body {
  margin: 0 0;
  padding: 0 0;
}
.myPage {
  width: 100%;
  height: 100vh;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  font-family: 'Open Sans', sans-serif;
  background: #ddd;
}
/* end */


/* Nav Button */
.navMenu {
  position: absolute;
  width: 40px;
  height: 40px;
  top: 30px;
  right: 30px;
  font-size: 40px;
  font-weight: 700;
  cursor: pointer;
}

/* The Overlay (background) */
.overlay {
    /* Height & width depends on how you want to reveal the overlay (see JS below) */    
    height: 0%;
    width: 100%;
    position: fixed; /* Stay in place */
    z-index: 999999; /* Sit on top */
    left: 0;
    top: 0;
    background-color: rgb(51,51,51); /* Black fallback color */
    background-color: rgba(0,0,0, 0.9); /* Black w/opacity */
    overflow-y: hidden;
    transition: 0.5s;
}

/* Position the content inside the overlay */
.overlay-content {
    position: relative;
    top: 25%;
    width: 100%;
    text-align: center; /* Centered text/links */
    margin-top: 30px; /* 30px top margin to avoid conflict with the close button on smaller screens */
}

/* The navigation links inside the overlay */
.overlay a {
    padding: 8px;
    text-decoration: none;
    font-size: 36px;
    color: #fff !important;
    display: block; /* Display block instead of inline */
    transition: 0.3s; /* Transition effects on hover (color) */
		text-transform: uppercase;
    font-family: 'Open Sans', sans-serif;
}

/* When you mouse over the navigation links, change their color */
.overlay a:hover, .overlay a:focus {
    color: #999 !important;
}

/* Position the close button (top right corner) */
.closebtn {
    position: absolute;
    top: 30px;
    right: 30px;
    font-size: 60px !important; /* Override the font-size specified earlier (36px) for all navigation links */
}

/* When the height of the screen is less than 450 pixels, change the font-size of the links and position the close button again, so they don't overlap */
@media screen and (max-height: 450px) {
  .overlay {overflow-y: auto;}
  .overlay a {font-size: 20px}
  .closebtn {
    font-size: 40px !important;
    top: 15px;
    right: 35px;
  }
}


              
            
!

JS

              
                <!-- FULL PAGE MENU = = = = = -->
/* Open */
function openNav() {
    document.getElementById("myNav").style.height = "100%";
}

/* Close */
function closeNav() {
    document.getElementById("myNav").style.height = "0%";
}
              
            
!
999px

Console