The drop-down menu seems to be struggling to remain open

This is a common issue that has been discussed on SO many times, but unfortunately, none of the threads seem to have provided a solution. The problem I am facing is that the dropdown menu items do not stay open unless I continuously hover over the initial item. I have checked all the classes thoroughly, but I cannot pinpoint where the issue lies. Any assistance would be greatly appreciated.

nav ul {
    list-style: none;
}
nav ul li {
    display: block;
    float: right;
}
nav ul ul {
    display: none;
    position: relative;
    margin-top: 60px;
}
nav ul li:hover > ul {
    display: block;
    position: absolute;
    margin-left: -30px;
}
nav ul ul li {
    width: 170px;
    float: none;
    display: block;
}
#navigation_bar a {
    display: block;
    float: right;
    padding: 5px;
    font-size: 25px;
    color: black;
}
#navigation_bar a:hover {
    border-radius: 20px;
    color: #FFFFFF;
    transition: color 0.2s;
}
div nav {
    display: block;
}

Below is the HTML code corresponding to the CSS above:

<div id="navigation_bar">
    <nav>
        <ul>
            <li><a href="">Home</a></li>
            <li><a href="">Services</a></li>
            <li><a href="">Media Center</a>
                <ul>
                    <li><a href="">Latest News</a></li>
                    <li><a href="">Image Gallery</a></li>
                </ul>
            </li>
            <li><a href="">Downloads</a></li>
            <li><a href="">Contact Us</a></li>
        </ul>
    </nav>
</div>

Answer №1

The reason for this issue is the slight gap between the main navigation and the dropdown menu. When you move your cursor over this gap, it causes the li:hover state to be lost, which then hides the dropdown.

nav ul ul {
    ...
    margin-top: 43px;
    ...
}

You can see an example of this behavior in action here: https://jsfiddle.net/mq29ac39/1/

If you compare it with the original code where the margin-top was set to 63px, you'll notice the difference: https://jsfiddle.net/mq29ac39/2/

I added a background color to highlight the gap visually.

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