The <ul> in my nav extends to the side of the page - html

Question

I have a nested <ul> within my nav ul. When the <ul> has only one element its padding is fine and the <li> fits nicely. However when I have more than one element in the nested <ul> it extends to the side of the page. I can see nothing to do with padding changes in my :first-child or anything in my css for the nested <ul>.
The nested ul with multiple elements
The nested ul with only one element
Here is the HTML:
<header id="header" class="alt">
<h1><strong>South Somerset Motocross Club</strong></h1>
<nav id="nav">
<ul>
<li>Home</li>
<li><a>Info</a>
<ul>
<li>Club Rules</li>
<li>Pre-Race Bike Check</li>
<li>Job Descriptions</li>
<li>Race Fees</li>
<li>Groups And Ages</li>
</ul>
</li>
<li><a>About Us</a>
<ul>
<li>Our Heritage</li>
<li>Committee</li>
</ul>
</li>
<li><a>News</a></li>
<li>Fixtures</li>
</ul>
</nav>
</header>
Here is the CSS:
#header nav {
height: inherit;
line-height: inherit;
position: absolute;
right: 1.25em;
top: 0;
vertical-align: middle;
}
#header nav ul {
list-style: none;
margin: 0;
padding-left: 0;
}
#header nav ul li {
color: #fff;
display: inline-block;
padding-left: 10px;
padding-right: 10px;
margin-left: 1em;
}
#header nav ul li ul {
display: none;
padding: 0;
margin: 0;
background-color: #eee;
border-radius: 4px;
}
#header nav ul li:hover ul {
display: block;
position: absolute;
}
#header nav ul li ul li {
border-radius: 4px;
margin: 0 0 0 0;
padding-left: 4px;
padding-top: 1px;
padding-right: 4px;
width: 100%;
color: black;
font-size: 12pt;
}
#header nav ul li ul li a {
color: #111;
padding: 0;
margin: 0;
display: block;
}
#header nav ul li ul li a:hover {
color: rgba(255, 255, 0, 1);
}
#header.alt nav ul li ul li a:hover {
color: rgba(255, 255, 0, 1);
}
#header.alt nav ul li ul li:hover {
background-color: #3477ff;
}
#header nav ul li ul li:hover {
background-color: #3477ff;
}
#header.alt nav ul li ul li a {
color: #000;
padding: 0;
display: block;
}
#header nav ul li a {
-moz-transition: color 0.1s ease-in-out;
-webkit-transition: color 0.1s ease-in-out;
-ms-transition: color 0.1s ease-in-out;
transition: color 0.1s ease-in-out;
color: #000;
display: inline-block;
text-decoration: none;
}
#header nav ul li a:hover {
color: #000;
}
Any ideas on how I can keep the width of the <ul> to the max length of one of the items?

Answer 1

Add display block in
#header nav ul li ul li {
border-radius: 4px;
margin: 0 0 0 0;
padding-left: 4px;
padding-top: 1px;
padding-right: 4px;
width: 100%;
color: black;
font-size: 12pt;
display:block;
}
here is the fiddle

Answer 2

Yop!
i checked Your css and the problem was here:
#header nav ul li ul li {
border-radius: 4px;
margin: 0 0 0 0;
padding-left: 4px;
padding-top: 1px;
padding-right: 4px;
width: 100%;
color: black;
font-size: 12pt;
}
Which i changed to this:
#header nav ul li ul li {
border-radius: 4px;
margin: 0 0 0 0;
padding-left: 4px;
padding-top: 1px;
padding-right: 4px;
//width: 100%;
display:table;
color: black;
font-size: 12pt;
}
So now it's getting the width of longest item :)
Hope i helped!