body{
background-color: #fff;
margin:3% 10% 0% 10%;
}

ul#navigation {
padding: 0;
margin: 0;
background-color: #039;
color: #ff0;
float: left;
width: 100%;
}
ul#navigation li { display: inline; }
ul#navigation li a {
padding: .25em 1em;
background-color: #039;
color: #ff0;
text-decoration: none;
float: left;
border-bottom: solid 1px #fff;
border-top: solid 1px #fff;
border-right: solid 1px #fff;
}
a:link, a:visited { color: #fff; }

a#calcu {
color: #ff0;
background-color: #000;
}
a#lnk {
color: #00f;
background-color: #fff;
text-decoration:none;
}

ul#navigation li a:hover {
color: #000;
background-color: #ff0;
}
ul#navigation li#youarehere a { background-color: #09f; }