how to put a single navigation item on the right - html

Question

good day i need help to separate my navigation bar the WELCOME ADMIN should be on the right side here is my code.
HTML
<div id="menu">
<ul>
<li>item1</li>
<li>item1<ul>
<li>item1</li>
<li>item1</li>
<li>item1</li></ul>
</li>
<li>item1</li>
<li>item1<ul>
<li>item1</li>
<li>item1</li>
<li>item1</li></ul>
</li>
<li class="right"><a href="#" >Welcome Admin</a>
<ul>
<li>Subitem One</li>
li>Subitem Two</li>
<li>Subitem Three</li>
</ul>
</li>
</ul>
</nav>
CSS
#menu {
background:#000;
width:100%;
margin-top:0px;
height:40px;
border-radius: 3px;
}
#menu ul ul {
display: none;
}
#menu ul li:hover > ul {
display: block;
}
#menu ul {
background: #000
padding: 0px;
border-radius: 5px;
float:left;
list-style: none;
margin-top:-20px;
position: relative;
display: inline-table;
}
}
#menu ul:after {
content: ""; clear: both; display: block;
}
#menu ul li {
float: left;
}
#menu ul li:hover {
color:#fff;
}
#menu ul li:hover a {
background:#fff;
color: #000;
}
#menu ul li a {
display: block; margin-top:20px;
padding:10px 5px;
color: #FFF; text-decoration: none;
}
#menu ul ul {
background: #fff;
padding:0;
position: absolute;
top: 80px;
box-shadow: 0px 0px 9px rgba(0,0,0,0.15);
}
#menu ul ul li {
float: none;
position: relative;
}
#menu ul ul li a {
padding: 15px 40px;
color: #fff;
}
#menu ul ul li a:hover {
background: #000;
color:#fff;
}
thankyou for your answers badly need your help for this projects thankyou for those who will answer

Answer 1

You need to specify the width of the ul as 100% otherwise the float:left on it collapses the uls width.
The just float the last li to the right.
JSFiddle Demo
CSS
#menu {
background:#000;
width:100%;
margin-top:0px;
height:40px;
border-radius: 3px;
}
#menu ul ul {
display: none;
}
#menu ul li:hover > ul {
display: block;
}
#menu ul {
background: #000;
width:100%;
padding: 0px;
border-radius: 5px;
float:left;
list-style: none;
margin-top:-20px;
position: relative;
display: inline-table;
}
#menu ul:after {
content: ""; clear: both; display: block;
}
#menu ul li {
float: left;
}
#menu ul li:hover {
color:#fff;
}
#menu ul li:hover a {
background:#fff;
color: #000;
}
#menu ul li a {
display: block; margin-top:20px;
padding:10px 5px;
color: #FFF; text-decoration: none;
}
#menu ul ul {
background: #fff;
padding:0;
position: absolute;
top: 80px;
box-shadow: 0px 0px 9px rgba(0,0,0,0.15);
}
#menu ul ul li {
float: none;
position: relative;
}
#menu ul ul li a {
padding: 15px 40px;
color: #fff;
}
#menu ul ul li a:hover {
background: #000;
color:#fff;
}
#menu ul li.right {
float:right;
}

Answer 2

I have corrected your css and updated here.
html
<div id="menu">
<ul>
<li>item1 </li>
<li>item1
<ul>
<li>item1 </li>
<li>item1 </li>
<li>item1 </li>
</ul>
</li>
<li>item1 </li>
<li>item1
<ul>
<li>item1 </li>
<li>item1 </li>
<li>item1 </li>
</ul>
</li>
<li class="last">
Welcome Admin
<ul>
<li>Subitem One</li>
<li>Subitem Two</li>
<li>Subitem Three </li>
</ul>
</li>
</ul>
</div>
css
#menu {
background:#000;
width:100%;
height:40px;
border-radius: 3px;
float:left;
}
#menu ul ul {
display: none;
}
#menu ul li:hover > ul {
display: block;
}
#menu ul {
padding: 0px;
border-radius: 5px;
list-style: none;
margin:0;
position: relative;
display: block;
}
#menu ul:after {
content:"";
clear: both;
display: block;
}
#menu ul li {
float: left;
}
#menu ul li:hover {
color:#fff;
}
#menu ul li:hover a {
background:#fff;
color: #000;
}
#menu ul li a {
display: block;
padding:0 10px;
color: #FFF;
text-decoration: none;
line-height:40px;
}
#menu ul ul {
background: #fff;
padding:0;
position: absolute;
top: 40px;
box-shadow: 0px 0px 9px rgba(0, 0, 0, 0.15);
}
#menu ul ul li {
float: none;
position: relative;
}
#menu ul ul li a {
padding: 15px 40px;
color: #fff;
}
#menu ul ul li a:hover {
background: #000;
color:#fff;
}
#menu ul li.last {
float:right;
}