body {
   font-family: Arial, serif;
   background-color: #0000FF;
   
}

.caja {
        margin-left:15%;
        margin-right:15%;
        padding: 2%;
        background-color:#58FAF4;
}

header{
   font-size:2.5em;
   font-family:"Arial", cursive,sansserif;
   color:#E6E6E6
   background-color:#D8D8D8
   text-align:center;
 }
section{
   background-color:#fff;;
}
h1 {
 background-color:#fff;
}