.header  {display: grid; grid-template-columns: 170px 530px 280px;}
.comer   {display: grid; grid-template-columns: 330px 330px 330px;}
.seccion {display: grid; grid-template-columns: 1fr; background-color: #F1C40F;
          margin: 5px; font-size: 20px;}
.footer  {display: grid; grid-template-columns: 330px 330px 330px;}