*{box-sizing: border-box; padding: 0; margin: 0}

/* estructura */




header 
{width: 100%;
height: 15rem;
background-color: #56d6c9}


.contenedora
{width: 100%;
 height: 65rem;   
 background-color: #af72c1;
 margin: 5px 0px 5px 0px; display: flex; flex-wrap: wrap; justify-content: center }


.cajas
{width: 95%;
background-color:#3a75c4 ; 
height:730px; ;
margin: 20px 10px 5px 10px; align-self: auto;
    display: flex; flex-wrap: wrap; justify-content: center
}

.ancho100 
{width:90%;
background-color:#e8ed60;
height: 20rem;
margin: 30px 5px 2px 5px;}

.ancho33 
{width: 30%; 
background-color: #e8ed60;
height: 15rem; margin: 2px 5px 20px 5px; align-self: flex-end 
  }


aside
{width: 99%;
background-color: #e0d1c6; 
height: 15rem; 
margin: 20px 10px 20px 10px; align-self: flex-end } 


footer {width: 100%;background-color:#006b3f; height: 20rem;}