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#nav {
  float: right;
  padding: 42px 0 0 30px;
  }

#nav li {
  float: left;
  margin: 0 0 0 5px;
  }

#nav li a {
  padding: 5px 15px;
  font-weight: bold;
  color: rgba(255, 255, 255, 0.7);/* the white at 70% opacity via RGBA lets the background shine through, ever so slightly.*/
  }

/*“When using RGBA to assign color values, it’s good practice to specify a solid color first, 
as a fallback for browsers that don’t yet support RGBA.  Specify solid backups for RGBA colors 
in a separate rule that appears before the RGBA rule.”*/
#nav li a {
  padding: 5px 15px;
  font-weight: bold;
  color: #ccc;
  color: rgba(255, 255, 255, 0.7);
  }

/*“let’s add a very subtle text-shadow. We’ll use RGBA again here to define the shadow’s 
color, letting the semi-transparent black at 50% opacity blend into the background behind it.”*/
#nav li a {
  padding: 5px 15px;
  font-weight: bold;
  color: #ccc;
  color: rgba(255, 255, 255, 0.7);
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.5); 
  }

/*We’re going to add a color change and background color to the :hover state of each link. Once again, we’ll use RGBA to set a semi-transparent 
white background behind the text on :hover.*/
#nav li a {
  padding: 5px 15px;
  font-weight: bold;
  color: #ccc;
  color: rgba(255, 255, 255, 0.7);
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.5);
  }

#nav li a:hover,
#nav li a:focus {
  color: #fff;”
..background: rgba(255, 255, 255, 0.15);
  }”

/*Adding border radius for all browsers. */
#nav li a {
  padding: 5px 15px;
  font-weight: bold;
  color: #ccc;
  color: rgba(255, 255, 255, 0.7);
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.5);
  -webkit-border-radius: 14px;
  -moz-border-radius: 14px;
  border-radius: 14px;
  -webkit-transition: all 0.3s ease-in-out; 
  -moz-transition: all 0.3s ease-in-out;
  -o-transition: all 0.3s ease-in-out;
  transition: all 0.3s ease-in-out;”
  }/*Note that the border radius would normall be placed on the :hover.  But, there's a transition effect here that makes the border pill shape
invisible at it's begining state, and then fully visible on the effect action (hover, focus, etc.).*/

#nav li a:hover,
#nav li a:focus {
  color: #fff;
  background: rgba(255, 255, 255, 0.15);
  }

“<ul id="nav">
  <li><a href="#">News</a></li>
  <li><a href="#">Things</a></li>
  <li><a href="#">Stuff</a></li>
  <li><a href="#">Junk</a></li>
  <li><a href="#">About</a></li>
</ul>”

<!-- website example: http://css3exp.com/code/view/ -->