How to cover the whole screen when the hamburger menu is pressed on smaller screens?

Last Updated : 27 Aug, 2019

Bootstrap provides a class to overlay the content and different style properties to make it appear more attractive. To fill the viewport or whole screen with .nav-bar change the height.

.navbar-nav{
min-height: 100vh;
}

Example:

<!DOCTYPE html> 
<html> 
  
<head> 
    <meta name="viewport" 
          content="width=device-width, initial-scale=1"> 
    <style> 
        body { 
            font-family: 'Lato', sans-serif; 
        } 
          
        .overlay { 
            height: 100%; 
            width: 0; 
            position: fixed; 
            background-color: rgb(255, 255, 255); 
            background-color: rgba(0, 96, 128, 0.9); 
            overflow-x: hidden; 
            transition: 0.5s; 
        } 
          
        .overlay-content { 
            position: relative; 
            top: 25%; 
            width: 100%; 
            text-align: center; 
            margin-top: 30px; 
        } 
          
        .overlay a { 
            padding: 8px; 
            text-decoration: none; 
            font-size: 36px; 
            color: #000000; 
            display: block; 
            transition: 0.3s; 
        } 
          
        .overlay a:hover, 
        .overlay a:focus { 
            color: #f1f1f1; 
        } 
          
        .overlay .closebtn { 
            position: absolute; 
            top: 20px; 
            right: 45px; 
            font-size: 60px; 
        } 
          
        @media screen and (max-height: 450px) { 
            .overlay a { 
                font-size: 20px 
            } 
            .overlay .closebtn { 
                font-size: 40px; 
                top: 15px; 
                right: 35px; 
            } 
        } 
    </style> 
</head> 
  
<body> 
  
    <div id="myNav" class="overlay"> 
        <a href="javascript:void(0)" 
           class="closebtn"
           onclick="closeNav()">×</a> 
        
        <div class="overlay-content"> 
            <a href="#">Login</a> 
            <a href="#">SignUp</a> 
            <a href="#">AboutUs</a> 
            <a href="#">ContactUs</a> 
        </div> 
    </div> 
  
    <h2 style="background-color:green;  
               color:white; 
               height:40px ">GeeksforGeeks 
<span style="font-size:30px; 
             cursor:pointer;  
             float:right; " 
      onclick="openNav()">Menu</span></h2> 
    
    <h1 style="text-align:center;  
               color:green">Overlay the content</h1> 
    <script> 
        function openNav() { 
            document.getElementById( 
              "myNav").style.width = "100%"; 
        } 
  
        function closeNav() { 
            document.getElementById( 
              "myNav").style.width = "0%"; 
        } 
    </script> 
  
</body> 
  
</html> 