body, html {
 text-align:center;
 width:100%;
 height: 100%;
  margin:0;
  padding:0;
 background: url(../images/fondo22.jpg) no-repeat center center fixed; 
 -webkit-background-size: cover;
 -moz-background-size: cover;
 -o-background-size: cover;
 background-size: cover;
}
video {

    width: 70%;
    height: auto;
}

img{
 margin:10px auto;
}
.arriba{
    background-color: #000000;
}
.abajo{
}