body {background-image: url("volcan.jpg"); background-repeat:repeat-y; background-position: center center; background-attachment: fixed; margin-left:15%; margin-right:15%;}
H3{color:white;font-family:sans-serif;}
H4 {color:white;font-family:sans-serif;}
H5 {color:white;font-family:arial;}
A:link{color:#99CCFF;text-decoration:none;}
A:visited{color:#0099CC;text-decoration:none;}
A img {border:none}

#nav ul {list-style: none; padding:0; margin:0;}
#nav li {display: inline; padding:0;border-left:0.1em solid yellow;}
#nav a {display:inline;width:5em;text-align: center;background: #333366;}
#tab {background-color: #333366; border-color: black; margin:8%;}
#tab2 {background-color: #333366; margin:8%;}