*{margin: 0; padding: 0;}
body{background: #524553;font-family: sans-serif; font-size: 20px;}
.contenedor {width: 960px; margin: 0 auto 0 auto}



header {background: #b560c4; height: 80px;}
nav {background:#fd97ea; height: 50px;} 
main {background: #fff; height: 800px;}

section {background: #407da2; height: 800px; width: 70%; position: relative; float: left}
section article {background: #18b9d6; height: 240px; width:96% ; position: relative; float: left; box-sizing: border-box; margin: 1.5%;padding: 5%; text-align: center; text-decoration: underline;}

aside {background: #c6c0a9; height: 400px ; width: 30%; position: relative; float: left}
aside article {margin: 1.5%;padding: 2%; text-align: center;}

footer {background: #aff4bf; height: 40px;}