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

.contenedor {max-width: 1000px; margin: auto;}

header {background-color: green; 
    padding: 3rem 0 3rem 0;
    text-align: center;
    color: white;
    font-family: serif;
        }

nav {max-width: 1000px; margin: auto;
    background-color: pink; 
    padding: 3rem 0 3rem 0;
    text-align: center;
    color: white;
    font-family: serif;
        }

 .main {max-width: 1000px; margin: auto;
    text-align: center;
    color: grey;
    font-family: serif;}

section {background-color: blue; 
    padding: 1rem 0 1rem 0;
    text-align: center;
    color: white;
    font-family: serif;
    width: 100%;
    
    
        }
.articulos {display: flex;
	justify-content: space-around;
	
}

article {background-color: orange; margin: 1rem;
    padding: 3rem 0 6rem 0;
    text-align: center;
    color: white;
    font-family: serif;
    width: 50%;
    height: 20rem;
   
    
        }

    
aside{background-color: gray; padding: 1rem 0 1rem 0; display: flex; justify-content: space-around}

.ancho60{background: orange; width: 60%; margin: auto;}

.ancho30{background: orange; width: 30%; margin: auto;}

footer {max-width: 1000px; margin: auto;
    background-color: greenyellow; 
    padding: 3rem 0 3rem 0;
    text-align: center;
    color: white;
    font-family: serif;
        }