<nav> element transparent without any previous opacity/transparency adjustments HTML/CSS - html

Question

I have noticed my nav bar is transparent and I would like it to not be. I have no previous opacity/transparency set that would cause it to be inheriting the property. I would like to make my nav bar non transparent.
Here is the CSS:
nav {
margin: 20px auto;
text-align: center;
}
nav ul ul {
display: none;
}
nav ul li:hover > ul {
display: block;
}
nav ul {
font-size: 25px;
background: white;
padding: 0px;
border-radius: 10px;
border-style: solid;
list-style: none;
position: relative;
display: inline-table;
}
nav ul:after {
content: "";
clear: both;
display: block;
}
nav ul li {
float: left;
}
nav ul li:hover {
background: black;
}
nav ul li:hover a {
opacity: 1;
color: white;
}
nav ul li a {
display: block;
padding: 15px 20px;
color: black;
text-decoration: none;
}
nav ul ul {
background: #000000;
border-radius: 0px 0px 10px 10px;
padding: 0;
position: absolute;
top: 100%;
}
nav ul ul li {
float: none;
}
nav ul ul li a {
padding: 15px 20px;
}
nav ul ul li a:hover {
background: #2E2E2E;
border-radius: 10px;
}
#welcome_paragraph {
position: relative;
top: 50px;
width: 500px;
margin: auto;
}
Here is the corresponding HTML:
<nav>
<ul>
<li>Information
<ul>
<li>Getting Started?</li>
<li>About Us</li>
<li>Contact</li>
</ul>
</li>
<li>Starter Kits</li>
<li>Rebuildables
<ul>
<li>Genesis</li>
<li>Dripper</li>
<li>Silica/Cotton</li>
</ul>
</li>
<li>Mods
<ul>
<li>Mechanical</li>
<li>Variable Voltage</li>
</ul>
</li>
<li>Accessories</li>
</ul>
</nav>
<p id="welcome_paragraph">
Welcome, blah blah (this text shows through the nav bar)<br />
</p>

Answer 1

HTML
<nav>
<ul>
<li>Information
<ul>
<li>Getting Started?
</li>
<li>About Us
</li>
<li>Contact
</li>
</ul>
</li>
<li>Starter Kits
</li>
<li>Rebuildables
<ul>
<li>Genesis
</li>
<li>Dripper
</li>
<li>Silica/Cotton
</li>
</ul>
</li>
<li>Mods
<ul>
<li>Mechanical
</li>
<li>Variable Voltage
</li>
</ul>
</li>
<li>Accessories
</li>
</ul>
</nav>
<p id="welcome_paragraph">Welcome, blah blah (this text shows through the nav bar)
<br />
</p>
CSS
nav {
margin: 20px auto;
text-align: center;
}
nav ul ul {
display: none;
}
nav ul li:hover > ul {
display: block;
}
nav ul {
font-size: 25px;
background: white;
padding: 0px;
border-radius: 10px;
border-style: solid;
list-style: none;
position: relative;
display: inline-table;
}
nav ul:after {
content: "";
clear: both;
display: block;
}
nav ul li {
float: left;
}
nav ul li:hover {
background: black;
position:relative;
z-index:1;
}
nav ul li:hover a {
color: white;
position:relative;
z-index:1;
}
nav ul li a {
display: block;
padding: 15px 20px;
color: black;
text-decoration: none;
}
nav ul ul {
background: #000000;
border-radius: 0px 0px 10px 10px;
padding: 0;
position: absolute;
top: 100%;
}
nav ul ul li {
float: none;
}
nav ul ul li a {
padding: 15px 20px;
}
nav ul ul li a:hover {
background: #2E2E2E;
border-radius: 10px;
}
#welcome_paragraph {
position: relative;
top: 50px;
width: 500px;
margin: auto;
color:white;
}
body
{
background-color:blue;
}
Updated CSS of yours
nav ul li:hover {
background: black;
position:relative;
z-index:1;
}
nav ul li:hover a {
color: white;
position:relative;
z-index:1;
}
Updated Fiddle

Answer 2

Have you tried;
nav {
background: white;
}
Elements are transparent unless you set a background on them or its inherited.
EDIT: If this doesn't help set up a fiddle for us jsfiddle.net.

Answer 3

In your css
nav ul {
font-size: 25px;
background: white;
padding: 0px;
border-radius: 10px;
border-style: solid;
list-style: none;
position: relative;
display: inline-table;
}
background is white.
If you change background to other colour may be your problem will go off. Hope it will help
Cheers !!