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How to make a nested sub menu on horizontal navigation bar vertical?

So I created a horizontal navigation bar, but I want the sub menu to appear vertically when hovered over, but whatever I tried, it still appears horizontally.

Here's a JSFiddle of my code: https://jsfiddle.net/ma85nbgx/

And below is my HTML and CSS.

HTML

<div class="nav"> <!-- Start of Nav Bar -->
    <ul>
        <li class="home"><a href="#">HOME</a></li>
        <li class="aboutus"><a href="#">ABOUT&nbsp;US</a></li>
        <li class="services"><a href="#">SERVICES</a>
            <ul>
                <li class="programs"><a href="#">PROGRAMS</a></li>
                <li class="events"><a href="#">EVENTS</a></li>
            </ul>
        </li>
        <li class="resources"><a href="#">RESOURCES</a></li>
        <li class="getinvolved"><a href="#">GET&nbsp;INVOLVED</a></li>
        <li class="contactus"><a href="#">CONTACT&nbsp;US</a></li>
    </ul>
</div>

CSS

.nav ul {
  list-style: none;
  text-align: center;
  padding: 0;
  margin: 0;
}

.nav ul li {
    font-family: 'Roboto', sans-serif;
    border-bottom: none;
    height: 86px;
    line-height: 86px;
    font-size: 14px;
    display: inline-block;
    float:left;
    margin: 0 auto;
}

.nav ul li a {
  text-decoration: none;
  color:#000000;
  display: block;
  transition: .3s background-color;
  padding:0 24px;
}

.nav ul li a:hover {
  background-color: #5c89c7;
  color:#FFFFFF;
}

.nav a {
    border-bottom:none;
}

.nav li ul {
    position:absolute;
    display:none;
    width:inherit;
}

.nav li:hover ul {
    display:block;
}

.nav ul li ul li {
  display: block;
}

Most of the websites or answer I went through said to put display:block on the nested sub menu, but I tried that and it still displays horizontally, any help would be appreciated!

try to something like this. Add the following css

.dropdown li{
  float: none !important;
}

Add .dropdown class in your sub-menu UL like this.

<ul class="dropdown">

I have changed your code little bit try with this answer , i have remove the nested li float:left , check the below of css i have added new lines

 .nav ul { list-style: none; text-align: center; padding: 0; margin: 0; } .nav ul li { font-family: 'Roboto', sans-serif; border-bottom: none; height: 86px; line-height: 86px; font-size: 14px; display: inline-block; float:left; margin: 0 auto; } .nav ul li a { text-decoration: none; color:#000000; display: block; transition: .3s background-color; padding:0 24px; } .nav ul li a:hover { background-color: #5c89c7; color:#FFFFFF; } .nav a { border-bottom:none; } .nav li ul { position:absolute; display:none; width:inherit; text-align:left; } .nav li:hover ul { display:block; } .nav ul li ul li { display: block; float:none !important; /* newly added */ height:auto; /* newly added */ line-height:34px; /* newly added */ } 
 <!doctype html> <html> <head> <meta charset="utf-8"> <title>Untitled Document</title> </head> <body> <div class="nav"> <!-- Start of Nav Bar --> <ul> <li class="home"><a href="#">HOME</a></li> <li class="aboutus"><a href="#">ABOUT&nbsp;US</a></li> <li class="services"><a href="#">SERVICES</a> <ul> <li class="programs"><a href="#">PROGRAMS</a></li> <li class="events"><a href="#">EVENTS</a></li> </ul> </li> <li class="resources"><a href="#">RESOURCES</a></li> <li class="getinvolved"><a href="#">GET&nbsp;INVOLVED</a></li> <li class="contactus"><a href="#">CONTACT&nbsp;US</a></li> </ul> </div> </body> </html> 

put display flex and flex-direction on your wrap of submenu itself.

check this out

 nav ul { list-style: none; text-align: center; padding: 0; margin: 0; width:100%; display:flex; flex-direction:row; flex-wrap:wrap; } nav ul li { font-family: 'Roboto', sans-serif; border-bottom: none; height: 86px; line-height: 86px; font-size: 14px; margin: 0 auto; position:relative; } nav ul li a { text-decoration: none; color:#000000; display: block; transition: .3s background-color; padding:0 24px; } nav ul li a:hover { background-color: #5c89c7; color:#FFFFFF; } nav a { border-bottom:none; } nav .withSubMenu ul{ display: none; } .withSubMenu:hover ul { display:flex; width:100%; flex-direction:column; } 
 <nav> <!-- Start of Nav Bar --> <ul> <li class="home"><a href="#">HOME</a></li> <li class="aboutus"><a href="#">ABOUT&nbsp;US</a></li> <li class="services withSubMenu"><a href="#">SERVICES</a> <ul> <li class="programs"><a href="#">PROGRAMS</a></li> <li class="events"><a href="#">EVENTS</a></li> </ul> </li> <li class="resources"><a href="#">RESOURCES</a></li> <li class="getinvolved"><a href="#">GET&nbsp;INVOLVED</a></li> <li class="contactus"><a href="#">CONTACT&nbsp;US</a></li> </ul> </nav> 

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