Try adding a background image in the html and css behind the navigation bar so that the space does not show up when scrolling

Question

I don't know how to make the background image in html and css fill below the navbar and footer. When I scroll the navigation bar the space is just a blank space, I want it to scroll without space at the top and bottom. Thanks!

* {
  box-sizing: border-box;
}
  body, html {
  margin: 0 auto;
  padding: 0;
}

.background-container {
  background-image: url("http://placekitten.com/g/500/500");
  background-size: cover;
  background-position: center;
  position: fixed;
  width: 100%;
  height: 100%;
  opacity: 0.5;
  z-index: -1;
  background-repeat: no-repeat;
}


.logo-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 30%; /* Adjust the height as needed */
}

.logo-container img{
  max-width: auto;
  max-height: 600px;
  text-align: center;


}

@media screen and (max-width: 768px) {
  /* Adjust background image for mobile devices */
  .background-container {
    background-position: center;
    height: auto;
  }
}

.footer {
  padding: 25px 0;
  background-color: #f2f2f2;
  bottom: 0;
  width: 100%;
}
.navbar {
  margin-bottom: 0;
  border-radius: 0;
  margin: 0;
  padding: 0;
  width: 100%;
  overflow: auto;
}


@media (max-width: 768px) {
  .logo-container {
    margin-top: 50px;
  }


  .footer {
    position: relative;
  }
  .navbar {
      position: relative;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">

<nav class="navbar navbar-expand-sm navbar-light bg-light">
  <a class="navbar-brand" href="#">The Backyard</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarNav">
    <ul class="navbar-nav ml-auto">
      <li class="nav-item active">
        <a class="nav-link" href="#home">Home</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#about">About</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#events">Events</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#contact">Contact</a>
      </li>
    </ul>
  </div>
</nav>

<div class="background-container"></div>
  <div class="logo-container">
    <img src="http://placekitten.com/g/100/100" alt="Logo">
    </div>

<footer class="footer">
  <div class="container">
    <p>The Backyard<br>
      at Boca Fiesta & Palomino<br>
      232 1/2 SE 1st st.<br>
      Gainesville, FL 32601</p>
  </div>
</footer>

I tried changing the code on the css and html but nothing seemed to change the results.

Answer 1

In my comment to your question I suggested applying a background image to the body, but I can't imagine how you would apply opacity this way. So just move

to the top of the page.

* {
  box-sizing: border-box;
}
  body, html {
  margin: 0 auto;
  padding: 0;
}

.background-container {
  background-image: url("http://placekitten.com/g/500/500");
  background-size: cover;
  background-position: center;
  position: fixed;
  width: 100%;
  height: 100%;
  opacity: 0.5;
  z-index: -1;
  background-repeat: no-repeat;
}


.logo-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 30%; /* Adjust the height as needed */
}

.logo-container img{
  max-width: auto;
  max-height: 600px;
  text-align: center;


}

@media screen and (max-width: 768px) {
  /* Adjust background image for mobile devices */
  .background-container {
    background-position: center;
    height: auto;
  }
}

.footer {
  padding: 25px 0;
  background-color: #f2f2f2;
  bottom: 0;
  width: 100%;
}
.navbar {
  margin-bottom: 0;
  border-radius: 0;
  margin: 0;
  padding: 0;
  width: 100%;
  overflow: auto;
}


@media (max-width: 768px) {
  .logo-container {
    margin-top: 50px;
  }


  .footer {
    position: relative;
  }
  .navbar {
      position: relative;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">

<div class="background-container"></div>

<nav class="navbar navbar-expand-sm navbar-light bg-light">
  <a class="navbar-brand" href="#">The Backyard</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarNav">
    <ul class="navbar-nav ml-auto">
      <li class="nav-item active">
        <a class="nav-link" href="#home">Home</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#about">About</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#events">Events</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#contact">Contact</a>
      </li>
    </ul>
  </div>
</nav>

  <div class="logo-container">
    <img src="http://placekitten.com/g/100/100" alt="Logo">
    </div>

<footer class="footer">
  <div class="container">
    <p>The Backyard<br>
      at Boca Fiesta & Palomino<br>
      232 1/2 SE 1st st.<br>
      Gainesville, FL 32601</p>
  </div>
</footer>

Answer 2

I don't know why you created a new element to put the BG image instead of just putting it on the tag, but your problem is because on small screens you are .background-container Sets the size of height:auto on the element.

You've created an element, fixed its position, and then set it to 100% high and 100% wide. When the screen size is smaller and you set height:auto, the height of the element is 0px because there is nothing inside the element.

* {
  box-sizing: border-box;
}
  body, html {
  margin: 0 auto;
  padding: 0;
}

.background-container {
  background-image: url("http://placekitten.com/g/500/500");
  background-size: cover;
  background-position: center;
  position: fixed;
  width: 100%;
  height: 100%;
  opacity: 0.5;
  z-index: -1;
  background-repeat: no-repeat;
}


.logo-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 30%; /* Adjust the height as needed */
}

.logo-container img{
  max-width: auto;
  max-height: 600px;
  text-align: center;


}

@media screen and (max-width: 768px) {
  /* Adjust background image for mobile devices */
  .background-container {
    background-position: center;
    /*height: auto;*/    /* <=======  REMOVE THIS */
  }
}

.footer {
  padding: 25px 0;
  background-color: #f2f2f2;
  bottom: 0;
  width: 100%;
}
.navbar {
  margin-bottom: 0;
  border-radius: 0;
  margin: 0;
  padding: 0;
  width: 100%;
  overflow: auto;
}


@media (max-width: 768px) {
  .logo-container {
    margin-top: 50px;
  }


  .footer {
    position: relative;
  }
  .navbar {
      position: relative;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">

<nav class="navbar navbar-expand-sm navbar-light bg-light">
  <a class="navbar-brand" href="#">The Backyard</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarNav">
    <ul class="navbar-nav ml-auto">
      <li class="nav-item active">
        <a class="nav-link" href="#home">Home</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#about">About</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#events">Events</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#contact">Contact</a>
      </li>
    </ul>
  </div>
</nav>

<div class="background-container"></div>
  <div class="logo-container">
    <img src="http://placekitten.com/g/100/100" alt="Logo">
    </div>

<footer class="footer">
  <div class="container">
    <p>The Backyard<br>
      at Boca Fiesta & Palomino<br>
      232 1/2 SE 1st st.<br>
      Gainesville, FL 32601</p>
  </div>
</footer>