Drop down tab isnt working, when i hover over it disappears

HTML & CSS
1 
body {
    padding: 0;
	margin:0;
    font-family: Arial;
    font-size: 17px;
	background-image: url('images/lasvegas.jpg');
	background-repeat: no-repeat;
	background-position(x): center;
	background-position(y): center;
	background-size: cover;
	z-index:10;
	
}
#nav {
    background-color: #222;
	z-index: 9;
}
#nav_wrapper {
    width: 960px;
    margin: 0 auto;
    text-align: left;
}
#nav ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
    position: relative;
    min-width: 200px;
}
#nav ul li {
    display: inline-block;
}
#nav ul li:hover {
    background-color: #333;
}
#nav ul li a, visited {
    color: #CCC;
    display: block;
    padding: 15px;
    text-decoration: none;
}
#nav ul li:hover ul {
    display: block;
}
#nav ul ul {
    display: none;
    position: absolute;
    background-color: #333;
    border: 5px solid #222;
    border-top: 0;
    margin-left: -5px;
}
#nav ul ul li {
    display: block;
}
#nav ul ul li a:hover {
    color: #699;
}
#first_paragraph {
	background-color: rgba(200, 200, 200, 0.6);
	left: 40%;
    top: 40%;
    width: 550px;
    margin-top: -125px; 
    margin-left: -115px; 
    position: absolute;
	border-radius: 15px 0 15px 0;
	color: #fff;
	padding: 20px;
	box-sizing: border-box;
	z-index:-1;
}


	<div id="nav">
    <div id="nav_wrapper">
        <ul>
            <li><a href="index.html">Home</a>
            </li>
            <li> <a href="#">Requirements</a>

                <ul>
                    <li><a href="#">HighSchool Ed.</a>
                    </li>
					<li><a href="#">College Ed.</a>
					</li>
                    <li><a href="#">About</a>
                    </li>
                </ul>
        </ul>
    </div>
</div>
2

I’m not sure what the problem is, it appears to work for me.

3

I heard that that it was cause because of the video i have in the code, but i cant find what it is.

4

I don’t see any video in your code.
Do you have the whole code for the page?

5

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