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

/* estructura */

.contenedor {max-width: 75rem; margin: auto}
header {width: 100%; background: #10ba65; height: 10rem;}

/* nav {width: 100%; background: yellow; height: 4rem;} */

section {background: #17c4db; display: flex; justify-content: space-around; flex-wrap: wrap; width: 70%;}

section article {width: 30%; background: orange; height: 20rem; margin: 1rem 0 1rem 0;} 

aside {background: #acacac; display: flex; justify-content: space-around; width: 25%; height: 60rem}

/* aside .ancho65 {background: orange; height: 15rem; width: 65%; margin: 2rem 0;}
aside .ancho30 {background: orange; height: 15rem; width: 30%; margin: 2rem 0;} */

footer {width: 100%; background: #10ba65; height: 4rem;}