How to create: shrink navigation menu on scroll

How to shrink navigation bar on scroll

Step 1 - Add HTML:

Create navigation bar:

<div id="navbar">
  <a href="#default" id="logo">CompanyLogo</a>
  <div id="navbar-right">
    <a class="active" href="#home">Home</a>
    <a href="#contact">Contact</a>
    <a href="#about">About</a>
  </div>
</div>

Step 2 - Add CSS:

Set navigation bar style:

/* Create a sticky/fixed navigation bar */
#navbar {
  overflow: hidden;
  background-color: #f1f1f1;
  padding: 90px 10px; /* Larger padding, which will shrink on scroll (using JS) */
  transition: 0.4s; /* Add transition effect when padding is reduced */
  position: fixed; /* Sticky/fixed navigation bar */
  width: 100%;
  top: 0; /* At the top */
  z-index: 99;
}
/* Set the style of navigation bar links */
#navbar a {
  float: left;
  color: black;
  text-align: center;
  padding: 12px;
  text-decoration: none;
  font-size: 18px;
  line-height: 25px;
  border-radius: 4px;
}
/* Set the style of the logo */
#navbar #logo {
  font-size: 35px;
  font-weight: bold;
  transition: 0.4s;
}
/* Set the style for the link when the mouse hovers over it */
#navbar a:hover {
  background-color: #ddd;
  color: black;
}
/* Set the style for the active/current link */
#navbar a.active {
  background-color: dodgerblue;
  color: white;
}
/* Display some links on the right */
#navbar-right {
  float: right;
}
/* Add responsiveness - on screens narrower than 580 pixels wide, display the navigation bar vertically instead of horizontally */
@media screen and (max-width: 580px) {
  #navbar {
    padding: 20px 10px !important; /* Use !important to ensure that JavaScript does not override the padding on small screens */
  }
  #navbar a {
    float: none;
    display: block;
    text-align: left;
  }
  #navbar-right {
    float: none;
  }
}

// When the user scrolls down 80 pixels from the top of the document, adjust the navigation bar's padding and the logo's font size

window.onscroll = function() {scrollFunction()};
function scrollFunction() {
if (document.body.scrollTop > 80 || document.documentElement.scrollTop > 80) {
  document.getElementById("navbar").style.padding = "30px 10px";
    document.getElementById("logo").style.fontSize = "25px";
    else {
  }
    document.getElementById("navbar").style.padding = "80px 10px";
    document.getElementById("logo").style.fontSize = "35px";
  }
}

Try it yourself