body {
  background-image: url('Fondos/Mar.jpg'); 
  background-repeat: no-repeat ;
  background-size: 100% 100% ;
  background-attachment: fixed ;
  color: #112173;
  font-family: serif;
  line-height:80%;
  
}

.red {	height: 66%; width: 49%; position:absolute; left:0%; border: 0px dashed red;}
.blue {	height: 66%; width: 49%; position:absolute; right:0%; border: 0px dashed blue;}

a{display:block; width:100%; height:100%;}