header
{
   font-family: monospace;
    font-size: 20px;
    background:#F9CC5D;
    text-align: center;
    height: 100px;
    width: auto
}
ul {
    list-style: none;
    margin: 0px;
    padding: 10px;
}
li:hover {
    opacity: 0.25;
}
header ul li {
    background-color: #b7fbfd;
    float: left;
    margin-right: 14px;
}
header ul li a {
    background-color: rgb(144, 224, 221);
    text-decoration: none;
    color: #075471;
    display: block;
    height: 25px;
    line-height: 25px;
    padding-left: 12px;
    padding-right: 12px;
}
body
{
    background-color: bisque;
    text-align: center
}
#contenedora
{
    background-color: bisque;
    margin: auto;
    text-align: center
   }
#navegador
{
    background: #999;
    padding: 3px 10px 5px 10px;
    border-top: 1px solid #999;
    border-bottom: 1px solid #999;
}