#top {
    position: relative;
    background-color: #036fab;
    color: white;
    padding: 5px;
    margin: 0px 0px 10px 0px;
}

#bottom {
    position: relative;
    background-color: #c2dfef;
    padding: 5px;
    margin: 10px 0px 0px 0px;
}


#left {
    float: left;
    background-color: #000000;
    padding: 5px;
    width: 150px;
}

#right {
    float: right;
    background-color: #000000;
    padding: 5px;
    width: 150px;
}
.abajo{
    position: absolute;
    bottom: 0;
}
.center_content {
    position: relative;
    background-color: #dddddd;
    padding: 5px;
}
.titulo {

font-family: Arial Black; 
font-weight: bold; 

font-size: 30px; 
color: #fff; 

}
.negrita{
    font-family: Arial Black;
}
.centro{
    text-aling: center;
}
.izq{
    text-align: left;
}
.left_content {
    background-color: #dddddd;
    padding: 5px;
    margin-left: 170px;
}

.right_content {
    background-color: #dddddd;
    padding: 5px;
    margin: 0px 170px 0px 170px;
}

#top a:link, #top a:visited {
  color: white;
  font-weight : bold;
  text-decoration: none;
}

#top a:link:hover, #top a:visited:hover  {
  color: black;
  font-weight : bold;
  text-decoration : underline;
}