@import url(http://fonts.googleapis.com/css?family=Open+Sans:400,300,700);

body {
    font-family: "Open Sans", sans-serif;
    margin: 0 auto;
    width: 1024px;
}

body div#contenidoblanco{
    margin-right: auto;
    margin-left: auto;
    background: #ffffff;
    position: relative;
}

nav {
    background-color: rgba(201, 27, 27, 0.76);
}

nav ul {
    list-style-type: none;
    overflow: auto;
}

nav ul li{
    float: left;
    padding: 20px 20px;
    margin-right: 35px; /*espacio entre cuadros del navegador*/    
}

ul li a {
    color: white;
    text-decoration: none;
    font-size: 15px;
    font-family: sans-serif;
}

a:hover{
    color: black;
    text-decoration: line-through;
    
}

.active {
    background-color: black;
}

main section article div{
    padding: 12px;
}

main section article div#cuadro1{
   background-color: rgba(255, 204, 0, 0.35);
   float: left;
   margin-bottom: 15px;
   position: relative;
   border-top-width: 6px;
   border-top-style: solid;
   border-top-color: #FC0;
   /*height: 315px;*/
}

main section article div#cuadro2{
   background-color: rgba(255, 0, 216, 0.38);
   float: left;
   margin-bottom: 15px;
   position: relative;
   border-top-width: 6px;
   border-top-style: solid;
   border-top-color: #ff00d8;
   /*height: 315px;*/
}

main section article div#cuadro3{
   background-color: rgba(4, 167, 10, 0.46); 
   float: left;
   margin-bottom: 15px;
   position: relative;
   border-top-width: 6px;
   border-top-style: solid;
   border-top-color: #04a70a;
   /*height: 315px;*/
}